Yes you did replace compounds but WHAT compounds have you used ? currently I would NOT recommend to use good branded liquid metal comes with no pump out effect but it req. good skills and is bit dangerous on CPU specially direct on 1-st stage CPU second is alloy which is not that good with liquid metals (CPU is 2 stage construction) and it's CONDUCTS electricity you have to be VERY EXTRA CAREFUL.
All tests showing that you have NT-H1 it's hybrid compound best of both worlds I would recommend to use as in all tests in all pages i was browsing was after liquid metal compounds and difference in all ranges CPU power usage was about 1*C , just do NOT over do it as if you use to MUCH compound efficiency of thermal transfer drastically drops !!
I use CF on all of my PS3, it is very good but I have some issue:
My one PS3 2501a some times has freeze in mM, movie or in gaming and my other PS3 2501a's Sound LAG while running CF. But all of them have no issue without running CF. Some other PS3 have no issue while running CF. All my PS3 are on Rogero 4.40v3; mM 4.40 and CF 1.7
i am no expert.. i'd try installin rogero 4.40 v1 apparently rogero hasn't ever made a fw past 1 they are all 4.40.1 etc
the other thing is it sounds like a pre ylod of gpu but in a slim would be rare i guess. since ofw works fine it must be the cfw causing it and i've never heard of it. although all ps3 freeze in games etc every now and then,from my experience anyways... look at bf3 while trying to bring up scoreboard (select) in game.. lol
if its a minor inconvenience i wouldn't worry too much, but if its 5 times a day try different cfw.
I found the freeze's reason on my ps3 with Rogero 4.40 v3 is Control Fan Utility because when I don't open it to background running, my PS3 works perfectly in mM or game playing. So, I'm testing it on Rogero 4.41 v1 which has just released and hope it is great!