I can't comment on SP motors, but we have been running Trinity 13.5s on a Medium size carpet track and have found we can run 45-50' of boost with ACC rates as low as 100rpm/degree. As long as we keep the turbo very low, I'm currently only at 5', we don't have a problem with temps. However we only run 0' timing on the motor, and the MMM has extra timing built in. I would try turning the turbo way down, then increase the boost 5' or so at a time, bumping the ACC a bit at a time as well, while watching your temps. Good luck.