You might want to sure the MOSFETs are properly cooled before overclocking that 125W 955. Not that it'll cause you any danger, but you may not be able to test properly since OCP may very well kick in and too often. Right now they are unheatsinked and probably completely uncooled due to the TX3 tower cooler - and pushing over 125W - so they may get hot enough for OCP protection to kick in and throttle your CPU during load or even shut down the board.
As for the NB, at 2820 I'd say you're about at the limit for C3 revision IMCs
The main timings for RAM (CL, tRCD, tRP, tRAS, tRC, Command Rate) are the ones you try to lower. One at a time or for the first three values (CL, TRCD, tRP) three at a time (except maybe the middle value). Overclocking your RAM by speed or timings will also depend on your particular kit, rated speed/timings, and ICs if you can find them.