Finally I upgraded my firmware from 3.41 w/JB to OFW 3.55 and to Waninkoko CFW 3.55 V2. Must say everything works fine for me.
But I am really supprised that I am able to access PSN without any problems /can download stuff, buy stuff, synchronize trophies, play online b.g.Motorstorm/ - hope it will last. I did not set any proxies or anything. Does anybody have similar experience?