The immob res is very nice. If you haven't IOd out to have defense yet you probably won't notice the addition.
Assuming they can be run concurrently, I don't think the tiny amount of defense you get from running both is going to make much of a difference. Even if you're immobilized, if you're hovering out of melee range of mobs, you only have to worry about ranged attacks (which will come whether or not you can move around) or attacks that ground you. Since you are en/en, you have the tools to keep people away from you even if you get grounded. I personally don't think immobs are that big a deal for a ranged archetype, but others may disagree.
Arc ID#30821, A Clean Break
The only problem with defeating the Tsoo is that an hour later, you want to defeat them again!
"Life is just better boosted!" -- LadyMage
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Assuming they can be run concurrently, I don't think the tiny amount of defense you get from running both is going to make much of a difference. Even if you're immobilized, if you're hovering out of melee range of mobs, you only have to worry about ranged attacks (which will come whether or not you can move around) or attacks that ground you. Since you are en/en, you have the tools to keep people away from you even if you get grounded. I personally don't think immobs are that big a deal for a ranged archetype, but others may disagree.
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They do run concurrently. The combined bonus from both is 3.6 % ? Its not noticeable if you have no def sets but if you have gotten your def into the 20s or 30s its very noticeable.
Try this instead. Skip Combat Jumping, take 'you pick', Tough, and Weave from Fighting, then take Power Boost to double the base defense of Hover and Weave and slot the 3% Defense to all from Steadfast Protection, somewhere in Tough. You can fit all this pretty well by level 30 if you skip NRG melee attacks, but the Defense will out-perform the melee stuff so you'll like it. Then just look for IO sets with the Defense bonuses to improve further.
Quixotik
"I did not say this. I am not here." -Guild Navigator
I have always run hover and cj as part of my defense package... and I like it... does not eat up too many power choices, slots, or end... but remember its only part of the package, you still need some situational awareness...
I 3 slotted hover and 2 slotted cj with... doh whatever that universal travel power is... cant think of it atm... its the one that has the -4 knockback
I tried the tough weave combo, but did not like it becuase it used up two powers, were both toggles using end... and both wanted slots that I wanted to use in other places... just imho
If you 3 slot them both with Blessing of the Zephyr:
a) You're 30-40 million poorer 
b) You get +6.25% Def vs Aoe And Ranged on top of the 3.6% base from both powers.
c) You get Knockback protection.
So it's kind of worth it if you're rich.
Combat Jumping + Hurdle is amazing, not for the defense, but for the unsuppressed mobility. It is a large part of how I am able to do challenges like the RWZ challenge and Arcana's challenge.
I have a lvl 26 Eng/Eng blaster using hover as my def. I was wondering if tacking combat jumping for added def is worth tacking, particularly for the immobilization Res.