problem with gear ratio on xray T3

[moggy12]

i race on indoor carpet using 64dp spur size of 108 pinion of 38 fdr of 5.40 but the car was slow to accelarate so dropped down to 36 pinion (5.70 fdr) and went up 1 setting on the turbo of my speedpassion pro 2 speedo the car was slighly better on acceration but was quite a bit down on top speed 2 laps slower than when using 38 pinion should i go up 1 more on turbo on speedo using 36 pinion or drop 1 less on turbo and go back to 38 pinion ? motor is always around 60 c or any other suggestions would be gratefully received