o8′ w/ upgraded pistons, webcam, & T/P/Welded Crank MCX Stage I.

Alaska’s max fuel octane level is 90. I’m @ 12.8lbs boost (what it came set at, as I never adjusted it) but I am not messing w/ additives ect… I believe the kit was designed for 92-93 octane?

So.. Leave it? Or what is a good recommended boost level for 90 octane?