You're gonna have to figure out yourself what your car likes. Just use common sense when making changes. For me, I can advance my WOT timing 10 deg from the base WOT timing of 19/17 (that's low gear/high gear) with that boost level and gas without any knocking.
Good luck. The Trans+ with Extender is one of the best mods I've made to my car. Seemed a little intimidating at first, but once you get the hang of it, you'll at the control you have over your car's setup.