ok, after watching a couple of movies i think i can mark this as solved.
i think i still can see very very ocassional and small frame jumps, two or three in a full movie, but maybe it's just i'm obssesed with this right now,.
if they are there it's just 1% of what it was before, probably becasue what is being said about sync impossible to be 100% accurate.
thanks again for your help.