Hey Im running a Serpent Gt stock gears 15/19pinion 45/49 spur at local track (FBF) with a OS speed onroad 7 port. Car is very manageable but about 2/3rds into straight I feel it tops out and faster cars pull up. I have a RB 9 port that I run in my onraod pan car, It will continue to pull right up to the sweeper entry. If I were to opt to run the 9 port would I gear up on the spur? I understand that the pinion would be a more dramatic difference but I dont want to lose the bottom on the infield. 46/50 is available. Straightaway at FBF is 185ft corner to corner.