I been gone from the modding seen for a while but im coming back whats the best dex firmware out right now or the best cex my 3.55 ps3 should come in today so thanks for any recommendations

I quite like 4.50ita Dex. And use ITA official 4.70 spoof not had any problems so far

Yeah, I still don't understand much with the CFW other than the basics and some advanced stuff but I don't see why you would freeze that often. Have you tried installing homebrew apps to keep record of your CPU temperature and stuff? That could be the problem. You could try using a fan controller app to turn up the fan speed which will get more air flow so in theory it will be running cooler however it'll be louder.

Mostly when im doing stuff like mod menu's , when using multiman. What u mean with that app?