Alright, first thing's first, try setting the MAL and RP up a notch. Then set ALL of the northbridge/LTD voltages to 1.3v.
Contrary to the common belief, set the HTT to 4X. Granted I'm on an nvidia chipset but I've gained stability by upping to the 4X HTT link speed. (332FSB and I'm not the only one.)
DRAM strength is typically at 7 with your ram. Try that too. I've also found that PCIe frequency increases have given me stability in the graphics card arena (Again I'm not the only one. Most OCers who've come to this realization usually have stopped forum browsing) to the tune of 10MHz GPU and 30MHz memory on an xtx.
Something that just cought my eye.
Check you HDD and see if it is a "PATA" mode drive, I'm thinking it's not and you have that set.
Advanced SATA Feature>
RAID Function: Disabled
SATA Mode Select: Emulated PATA Mode
Don't know that that would effect the OCing but it may effect HDD performance if it's unnecessarly set.
And finally, + reps for suggestions (if i havne't given you one already)... This really is helping a lot