RB, I can relate to your dilemma because I live in Beaumont where it reaches over 100 with 100% humidity. I used to start getting knock with only 10 lbs of boost. Installed the V4 I/C, PTA 49, and SMC alky. Now, on a 100 degree day, I run 21# boost on 93 octane pump gas, the O2s vary according to the humidity but are usually between 775 and 800, and the knock remains at 0.0. The SMC alky kit helped the most. I believe alcohol supplementation is a must in our subtropical climate. Hope this helps, Good luck, Joel