Alpha Slot?

I have a Grav/Kin and was just curious about your thoughts on slotting.
Should I crank out recharge?

An argument can be made for any of the Alpha choices. It really depends on your build and playstyle. Certainly Spiritual is a good choice, as more Recharge is welcome on any controller. It can also buff your Stun, Heal, Slow, Jump and ToHit Buffs. However, you have Siphon Speed so your need for Recharge is not as high as other builds.

What about Nerve? Accuracy is important for a Kinetics because of all the siphon-type powers. Plus it buffs your Hold and, if you took a Defense-based APP or PPP shield, your Defense. Nerve is usually the last on the list for me, but I have it on my Plant/Kin (it buffs Confuse, too). With Decent Accuracy slotting, Nerve is often not needed, but it might work for you.

Cardiac is my most frequent choice on my characters. EndRdx is rarely slotted to the ED cap, and a Cardiac Alpha makes a huge difference. Plus you get Range and, if you took a resistance-based shield and for ID, you get Resistance. With Transfusion, you may not need this one, though. If you aren't having endurance issues, then it may not be the best choice.

Musclature buffs damage, and everyone needs more damage, right? However, if you have already slotted your damage powers to the ED cap, then you only get a little bit of added damage. Musclature can also buff your Immob duration and your EndMod (more buff and drain from Transference). But with Fulcrum Shift and Siphon Power, you probably don't need the extra Damage buff.

It really depends on what you see as your needs. Spiritual certainly hits several areas.

See I'm thinking Nerve might be the way to go.

With IOs and /kin, you're probably already getting plenty of recharge. With the incarnate trials though, you have to hit critters that are a few levels above you, so unless you have 2 acc in all your powers, you might find yourself missing a lot in some parts of the IO trials.

For me, I hate my holds to miss. Without domination, a miss means that there might likely be a window for that boss to hit me back (as I usually need two applications for it to stick).

I also like Nerve as I usually take a PPP that uses defense. I play my controllers pretty aggressively so I like to try to soft cap defense. It allows me to charge into crowds and those that I can't hold, can't hit me as much.

Just some thoughts.

As someone already said, I like Spiritual unless it's one of my Stormers, then I typically take Cardiac. I shy away from Nerve because I usually have more than enough extra accuracy to spare between slotting, set bonuses, and (on trials, especially) team buffs and debuffs.

Musculature isn't horrible conceptually because it lets you hit things harder, but I don't know that I would be comfortable taking it without being able to leverage the bonus through a blast or melee set's existing damage.