Savage X SS FLM Brushless Conversion

ok so i changed my gearing to 20/52 and the temps got to about 165 in 10 minutes of running on loose sand...since the sand was lose the tires were spinning a bit so that may have made the temp go up a bit...but it still seems warm to me...the esc and battery were fine temp wise. is there a better gearing i can try for lowering the motor temp?