Its not broken in yet...the P5 with 9901/41021 and 1.1 springs combo should have plenty of bottom end. Your buggy should have enough low end grunt to do donuts once broken in. Most nova sponsored drivers run the 9901/41021 combo. I like the 2096/41021 combo for a little less low end and more top end. Something else is wrong if you think your tune is good after breakin and you still don't have bottom end.