I'd move up to Elites... I have a pair of Elite plus and I recently got a pair of Premier's to try out (I had this paranoid thought for a while that I was overbooted), and while I have only skated in them a few times honestly I don't think they would withstand much jumping from me, nevermind a year's worth of doubles
I am traditionally very hard on boots though, and I really like the Elite Plus, and I am 100% positive now that the elite plus are right for me (I'll still be using the premiere's for moves and as a general backup pair - my current boots need to go in to Jackson to fix a problem I caused with the tongues). I used to skate in custom SP Teri's and I am happier with the Jacksons. I think you're definitely too big for the zero gravity - my understanding is that those are meant for little (<70lbs) kids.
I know compared to the Premiere's that my elite plus are cut lower in the back... probably about 1/2" lower? There is also (much) more padding at the achilles too. I'm not really sure how the regular elites compare though.