Castle 2200 on 4s or 6s

[tc3_racer_001]

my 1512 2d on 4s in a buggy gets easily up to 150, most of the time its a 150-165 after 6 minutes of racing... any suggestions? gear up or down? im geared pretty low and its a large track, but im barely at full throttle ant the end of the straight... what concerns me, is, its a track which requires constant thottle, around 1/4. this is what is heating it up, the rest is tiny blips before and during jumps and down the straight. kinda the wrong place but o well. its written now!

ambient was anything from 30C to 35 in the shade... in the sun it was 50+C!!!