I agree with Shredded Cheddar on Premeditation. I think it's the best 2 points you can spend as a full psi character. Conversely, I really didn't like LoC spec becuase I very rarely had fights go long enough to use LoC twice unless I was deliberately stringing them out, and the extra turn of duration is pretty meaningless. So I can't agree with SC on that, but it'll come down to how you play your character as to whether you get any use out of those spec points or not.
I really do like Thermodynamicity spec for min/maxing. It's the greatest output-increasing specialization you can have, and I'd always put 5/5 there before putting anything into LoC. Remember that the Thermodynamicity AP reduction is applied to the base ability cost, then the flat tranquility reduction is applied to whatever the modified AP cost is. So, for Tranquility builds, 5/5 Thermodynamicity can enable you to throw 8-9 abilities in a turn. It's simply devastating, if you have enough psi reduction to make it all work.
My Tranquility specialization point loadout, in order, is:
Premeditation cooldown reduction 2/2
Future Orientation 5/5
Thermodynamicity 5/5
(whatever I feel like) 3/?
If you have no other idea what to do with your points, try that. It'll probably impress you.