Took the plunge and added even more boost. I'd scored a 6" Bulldogge supercharger crank pulley, and when I took the car in last week to get my dying AC condenser replaced, I had them put the new pulley on too. Boost is now up to just a hair over 10PSI at peak.
 
I just thought it was fast before.
 
Common wisdom is that every pound of boost you add is good for something like 15-20 HP, and I added about 2.5 PSI. So somewhere around 35-50 more horsepower, not bad for $450 installed. 
 
Hopefully it'll all hold together, I'm banking on NickG's software and a properly functioning water injection setup to keep the peace. It WILL be on the dyno somewhere next week to check AF and power, for my own satisfaction and to allow NickG to do another tweak of the software if it proves necessary.
 
SPAL 16" slim line electric puller fan is in the mail, I'll install that next week for further insurance.