I use a tekin 17.5t sensored with the rs esc not too familiar with mamba esc's do they have an option to set a boost at a variable rpm range or turbo type setting? With 0 timing using 18/80 gearing and a 3s lipo I get speeds just barely faster than stock but tons more torque.
I have the timing advanced 2 out of 3 settings advanced on the esc settings, which helped but not quite there yet. No turbo setting or boost......