2.93 upper and 4lb lower works well, much past that I think it's just pumping some massive hot air out. FWIW my friend's '03 with 2.88 pulley (odd size) with stock lower and Steggy Stage III ran 11.42 so I'm sure you can get where you want. This was the previous owner's time with 17" M/T ET Streets. Mods were x-pipe/catback/pulley/Predator tune/metco intake/tr6 plugs.
The engine bay is looking good though, I hope winter is over fast lol.