I get what your saying....the 1550kv has more room for error in pinion choice because it has mroe torque but if geared properly the 2200 has the potential to yield an additional 10-12K RPMs Thats alot of potential top end speed lost... Now I knwo you can make up for some of the speed by using a bigger pinion on the 1550kv but I dont think you can completely compenate for a loss of 10 or 12k RPMs whith gearing.
EDIT: its actually not 10-12k its more like 14,400RPMs give or take a couple hundred.
22.2V X 1550 = 34,410RPMs
22.2 X 2200 = 48,840RPMs
Huge difference...If geared properly do you think youd run into heat problems? the LST2 is a big truck after all....Its alot of weight for the 2200 to lug around...