I have a 98 gmc Jimmy with a 4.3, powerdyne supercharger and methanol injection. I run premium as well. I punched the throttle and as I got to higherboost and rpms , it really started to ping so I obviously backed it down. The AFR on the wideband actually showed 11-12 which is good but the detonation is my concern. How do I change the timing in the upper rpms/ boost?