23 does sound really low unless you have outstanding cooling. I know b1g runs his at 3.3 with a 9x and 1.4v. Unless you've changed it b1g
I'm running mine at 8 multi and 413fsb with a 1.4v - though I haven't stressed it yet or even messed with the RAM. I will be doing so tonight. My idle temps are about 35 give or take a degree depending on daytime or evening ambients. I'm pretty sure you don't want to go above 1.6v to the vcore.
Like you, I'd also like to know other people's STABLE settings are at for their q6600's.
Edit** Found a good forum thread on all this somewhere else for some setting references
Post Your Q6600 G0 Overclocks w/ voltage - [H]ard|Forum