For end, slot the chance for +end in SC and Ball Lightning - That will keep your end up quite high! But TK is very end heavy, so it is used selectively.
Personally, I don't find TK that endurance heavy, even with a lot of Storm toggles running... although I do have 3 end mod and some +recov accolades/bonuses so...
I find Psy especially useful for my powersets, and you may find the extra hold perfect for things like Bosses, or PVP. The Psionic resistance is pretty worthless, and I've never taken Mass Hypnosis, but I really do like the set.
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The Psionic resistance is pretty worthless
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Hardily considering its in the top two types of damage thats hardest to get res for. Alot of psi mobs in the late game, plus great against those psi fenders in pvp
Have taken it and played against a few AVs last night, dominate is great and tbh the sheild with steamy mist means i have +30% resistance on everything apart from negative and toxic 
telekinesis is a strange one, havent got it fully slotted the way i want it yet but i can see it being usefull if another mob gets aggroed and the team needs some time to clear up prehaps i should have taken mass hypnosis for that instead?? its end heavy but i havent got all my accolades on this toon, and its just plain IO slotting so far, if i could get the build i wanted (can anyone loan me 300Mill )it wouldnt be a problem but i still havent fully IO setted my 2 mains .
My fender is kin/psi, so don't have to worry about endurance, what with transference up every 11 secs or so. I think that I toyed with all the epics (apart from Dark) - and narrowed it down to two; psi and electric. Took electric originally for another AoE attack (thunder strike) - but found that its animation time was ridiculous, and left me far too open and vulnerable and that I couldn't heal myself for over 3 seconds - not good.
Next up was power mastery - tried that for 2 reasons: Power Build Up (which, sadly, doesn't work with kinetics - one suggestion that has been made is that because the healing and endurance doesn't officially come from you - it comes from the mobs) and Total Focus. Total Focus looked yummy - especially combined with Fulcrum Shift. However, I quickly learned that it had just as long an animation time as Thunder Strike. Scratch the power mastery pool from my list too.
So last, but not least, I tried the psychic mastery pool. Oh my gosh, why did I not try this before? Now OK, maybe it fits into my build better cos a) my primary is Kinetics and b) my 2ndary is already Psi. But I used all the powers in this epic pool. Firstly, Dominate is ace - I already have a sleep (Will Domination), a disorient (Scramble Thoughts), an immobilise (Subdue) - this gave me my single-target hold - so I'm just about as trolly as a controller now Secondly, Mass Hypnosis is LURVELY for a) sleeping the mob before I run in with Fulcrum Shift (it doesn't wake them up) - which I could see you being able to use it for before running in with something like Lightning Clap - those that it misses would simply continue to sleep. Thirdly, the shield is brill - my defender has over 40% res to smashing/lethal damage (2 most common in the game) and almost 40% to psionics (very common in higher levels). Lastly - and least useful for me because of my other trolly powers - is Telekenisis; a real marmite power. Personally I love it (takes some getting used to) - but with an arsenal of mezzes at my disposal, I wasn't using it much so respecced out of it. With storm, I can also see that it probably wouldn't get much use - you've already got Herdicane, Tornado and Gale for moving mobs around - can't see that you'd need a 4th (if another mob gets agro'd, just fire off Mass Hypnosis).
So for me, psi epic wins (for my build - and think it'd certainly fit with your build too)
Hope this helps!
im loving the telekinesis > tornado combo it makes my laugh everytime 
I currently have Elec epic on my storm/elec mainly for powersink as it goes nicly with short circuit so i can act like a sapper against normal mobs this works great but wanted something a bit more ST orientated, have been playing around in MIDs looking at taking the Psy epic instead mainly for dominate and teleknesis the problem i see is going to be end use has anyone got this combo?
Any advice would be helpfull!