my M03R mini is currently with 11.5T brushless set-up and using 20T pinion. after running, i feel the motor is still cold. probably still under geared. and i feel it could give out more top end if geared appropriate

i would like to lower the FDR but i know we're limited to max 20T pinion.
i'm currently using this tire: http://sweepracing.com/?p=274

if i use the touring size rubber tire: http://sweepracing.com/?p=232, would this help out on my top end?

t-i-a