I had been running blinky 13.5 1s 12th scale with a rollout around 80mm and the GT2.1 EX with stock sensor at max timing. (10.2 fast laps)

But then with i installed the green sensor (set at 25*) and I had trouble finding the right rollout to improve. I went down close to 75mm but settled on 85mm because I was turning better laps there but was still slower than when I had the stock sensor installed by .4 seconds!!! ... on 90x36 high bite carpet ...

Any suggestions on rollout??? Did I go the wrong way? Not high enough?
Thanks in advance for any suggestions!!