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That depends on the enhancements you use.

Purples, the ATO sets, and store bought enhancements will all offer their bonuses down to level 10 (or the lowest level of the enhancement range for SBEs). Regular IOs are a bit more tricky.

With regular IOs you will lose the bonus when you exemp more than 3 levels below the IOs you have slotted. For example, if you slot 5 Positron's Blast IOs and they are all level 50, when you exemp below 47 you will lose all those bonuses. If those IOs are level 35, you will retain all bonuses until exemping below level 32. If you have a mixture of levels, you will retain bonuses corresponding to the lowest levels. For example, if you slot 3 level 50 Positron's Blast and 2 level 35 Positron's Blast, you will lose the recharge bonus, accuracy, and resistance (for 3, 4, and 5 parts of the set) below level 47, but keep the recovery bonus (for 2 parts of the set) until you exemp below 32.

This occasionally makes IOs below the cap more desirable though their enhancement value is somewhat lower.

Indeed. This is so far off topic to the Tank forum it astonishes me it hasn't be mod locked for allowing quibbling and arguing to continue.

Vet pets, the blue wisp and shield drone for example, can't be cast while flying but can be cast in the air. They can also fly.

Like the OP I don't know why the restriction is in place.

That would be unsurprising. Wind does tend to knock things over... lawn chairs, exterior decorations, trees.

That's highly doubtful. Perhaps, it would be more accurate to speculate it will be highly focused on single target damage. Though other sets that are single target focused aren't considered solo specialists, especially considering the preeminence of AoE damage in this game. Additionally, wouldn't it be foolish to base a support AT set in a MMO around a solo experience?

If it doesn't have -kb/kd in the AoE immobilize (assuming it has one) then it would mesh with Robots, at least as well as Gravity or Electric would. However, it's a rare recommendation to see someone suggesting particular extra-AT pairings.

Again, not something that would surprise me. As long as they can create and sell new powersets they're going to tap into as many viable ideas as possible. With wind, control sets have most traditional elements covered though there's still smudge room for water and metal (considering Eastern elemental standards). I would hope though that we see a Trap control set first to accommodate more natural/tech origin concepts.

It's possible, just not practical. It requires 325% recharge reduction to reduce Overgrowth's recharge to 60 seconds. Assuming 70% from Hasten and 95% from enhancement, you would still need 160% global bonuses. A recharge oriented Alpha slot will help ease those requirements, but you're still going to have to jump through some hoops to reach it. The minimum I can seem achieve in Mids' is 2 slotted Overgrowth with boosted level 50 IOs, Spiritual Core Alpha, Hasten, and 127.5% global recharge from IOs.

I missed that Vorpal Judgement was adding defense that wasn't reliably there until Riora pointed that out. Taking that into account, the only defense that's built to even moderate amounts is ranged. That begs the questions why 6-slot some of these powers for range defense bonus if it it's not a build focus.

For Spore Cloud those procs are fairly useless. They occur so infrequently and in such small amounts that unless you have other sources of end. drain or -recharge neither is worth using. I would probably suggest 4-slotting with Dark Watcher's Despair to reduce the endurance cost and increase the -to hit.

Now that you've posted a build I can offer some advice. The first thing to say is that you're missing the forest for the trees; you've chased defenses and left essentials powers like Strangler woefully underslotted, overslotted other powers for meaningless bonuses (e.g. 6 slots of Basilisk's Gaze in Vines), and poorly utilized procs. For the most part, I will only comment on the control side of the build.

Strangler: Single target holds are an essential part of a controllers arsenal and one of their only sources of single target damage. This needs 5-6 slots, 4 Basilisk's Gaze and 1-2 damage.

Entangle: A good source of single target damage. I would be hesitant to skip this on a character intended to solo or destined for iTrials. In other team play, it's less useful but trial AVs make it worthwhile to have more single target damage.

Roots: Additional duration of immobilize is rarely needed. Instead slot Roots for damage and procs. (Roots deals more damage than any other AoE immobilize.)

Seeds of Confusion: If money is no object slot Coercive Persuasion. It offers similar, but greater, bonuses and the proc is essentially a better chance to overpower with Seeds.

Spirit Tree: This is a power I tend to skip due to its stationary nature. It does get some consideration for AV fights. However, the amount of regen it offers seems a drop in the bucket compared to what you're gaining from NA.

Vines: Four slots of Basilisk's Gaze will suffice here. If you boost the enhancements, the essential aspects will all exceed +70% enhancement. Without boosters you can 5 slot this power with 4 from Basilisk's Gaze and a single triple from another set. Status resistance and a minor bit of regeneration aren't worth the final slots.

Carrion Creepers: The Force Feedback proc is a poor choice for Creepers. It will only proc on the player when the you initially cast Creepers. It may proc for the creeper vines, however, pets ignore all recharge changes so it's a wasted opportunity. Damage procs, however, are a generally good investment here.

Fly Trap: Other than the ranged bonus, there's little reason to 6-slot Fly Trap. As you already have a great deal of ranged defense, you may find better places to spend those 2 slots that aren't contributing to recharge.

QFE.

I don't recommend builds without a sound idea of how to play them. While somethings are fairly direct in the way they operate, there is a lot to this set that we simply have not experienced before. There's a new mechanic in Absorb. There's an area directed heal. There's an area toggle debuff (with area toggles being something we've only seen before in Dimension Shift). It's difficult to say how well any of these powers work until people have taken the time to actually use them.

Actually, anything over 3 points works such as Mesmerize's 3.5 magnitude sleep. I believe it's the only power with the odd half point of mez.

In addition to some of the conflicts Snowzone mentioned, I would be concerned about the damage procing from Envenomed Blades. Ticking toxic DoT would certainly interfere with the sleeps (as you can witness with Interface procs), but it may also provide more opportunities to strike back from Fear as opposed to a flat burst of damage.

I'm pretty much in the same boat. The blaster set has a lot of interesting things going on that make the dom set a little bland by comparison.

1. As a controller, you're not likely to lock down an AV on your own. It is, however, possible on a high recharge, perma-dom. Mind control is notable for the fact that you can perma-confuse an AV before engaging the fight and its fast activating single target hold makes it easier to actually stack enough holds to hold the AV.

2. Most control sets perform around the same level with a few exceptions. Plant, for instance, has a faster, longer duration every spawn control than most sets. Earth has a very good AoE hold and some extra AoE control in Earthquake. On the other end of the spectrum is Ice (limited benefits from Domination and an every spawn control that is often negated by others' immobilizes) and Gravity (for its late blooming nature).

3. For Earth, I like Fiery Assault (and Ice Mastery). That couples strong control with better than average damage. I also find Fiery is one of the better sets to be played at range, which meshes well with Earth. For Ice, I recommend Psionic Assault. Psi offers some additional slows to stack with the effects from Ice and has two powers that will have you in melee range often, Drain Psyche and Psychic Shockwave, which plays well with Arctic Air.

4. The playstyle is quite different. As a controller, you are constantly reapplying your controls for damage. As a dom, you'll lock things down then use your secondary for damage. The most notable way this plays out is how some controllers spam their AoE immobilizes for damage. A dom generally has better options than the aggro generating DoT of an immobilize.

Grav isn't bad. It does have a rough start up thanks to Wormhole coming in at level 26. After that though you've got a mag 6 aggroless stun. In order to mitigation the knockback from Wormhole, it does take some careful aiming (Hover helps) or you can simply move ahead of the group to lockdown the next mob (easily done thanks to WH being aggro-free) with annoying teammates.

They also take damage from quite a few things in iTrials such as the explosions from crates/vats in the Lambda and Marauder's nova fist thing.

Group Invisibility does reduced threat level and, unlike Superior Invisibility or Super Speed, its reduction in threat level does not suppress.

I'm actually finding it a bit easier to use than Fire Breathe. The damage/range enhancement from Posi's Blast makes Night Fall's range almost 70 feet which pairs up pretty well with Fearsome Stare. If you're playing a primary that really favors range like Mind or Gravity, Night Fall might be an easier power to mesh with the style than Engulfing Darkness.