So i′ve been using a unarmed character along with stealth but i am only able to get that suplex finisher , i know that there are other 2 stealth finishers , one that you break the guy′s neck and other where you choke him to death. they were added im patch 1.5 , i play on ps3. Have you guys ever got these finishers ?

What's your race? I almost never get them on my Highelf and Orc characters. I've yet to Properly test a Nord, but it would seem they suffer the same affliction.

I had those finishers, but then after patch 1.7 (I think) I never got them again

This sounds more reasonable, 'General Memory optimization' fixes are a bit vague in description. Maybe removed because they were inheritedly hard to get anyways.

I know of those finishers, but I've never seen them in my game.