The only rule U should respect:
NEVER touch a WORKING systemI'm mining with CGgminer 2.11.4 + 13.1 drivers, and everything is working good, so no update for me

I agree! I tried 13.1 and 13.4 last night; both introduced all kinds of problems/weirdness in my setup. The most stable combination for me has been cgminer 3.1.1 + Catalyst 12.8.
'If it ain't broke, fix it until it is.' → official motto of the United States government, not a Bitcoin miner.