Abit Av8 & A64 3400+ overclock troubles

Hi all. I'm trying to get this Abit AV8 and A64 3400+ combination to
rise to a respectable overclock without errors in Prime95 and having a
very hard time doing so. I'm assuming the 3400+ chip is NewCastle core
and rated for 2.2Ghz; the die is stamped with ADA3400DEP4AZ and an XPMW
4-letter code. I've got a Zalman AlCu cooler with a fan than can only
reach 2400RPM. The heat reaches an incredible 80C on some CPU
voltage/bus combinations (during Prime95). Also, I've recently flashed
the AV8's bios to the new version 24.

It looks like keeping the multiplier at 11 isn't the way to go and I'm
having some luck at 10.5 and 2289Mhz (but I really think I could do
better). I'm aiming to be milder at my CPU voltage bumps and this is
definitely helping the heat problem w/o sacrificing stability.

Given that I'm a OC noob, I'm hoping that someone has some insight into
this CPU/mobo combination or can offer some general hints. Anything
pertaining to LDT speed and HTT multiplier would help too.

thanks.