is there a stronger spring for the nemesis servo saver, i have my spring on my nemesis servo saver tightined down pritty tight, i installed a jr z9000t servo 320 oz torque. the wheels only slightly turn while on the ground. im using a 1400mah pack wich is brand new. what i notised is that the spring is giving, the part that the spring holds closed when you turn the wheel is opening up and not allowing the full power of the servo to turn the wheel. is there a firmer spring looks i will need something stiff because this servo has torque.