Bone stock on 93? Sounds not too low. Pressertech has one of the more conservative ECU tunes. More emphasis on a car you can just DD and forget, not necessarily chasing leaderboards.
393 whp is pretty good. Don't they also change the TCU and torque characteristics as well? Raw hp is not the only thing that helps so I would be interested in seeing a draggy and 1/4 mile run.