Higher endbell timing would increase amp draw and also lower the efficiency of the system (more power lost to heat etc) A larger cap won't stop amp draw but it will help the esc provide that 'punch' under load and make the ESC less prone to frying due to voltage spikes back under brakes (Which is why the Traxxas X01 has that huge cap pack, as the MMM Speedie does tend to go bang that way!)