It is possible that the dwell parameters are changing when you are rapid firing. Under rapid fire conditions the solenoid may not be able to stay fully engaged for the full duration of the dwell period if the power supply can't maintain full power to the circuit. The smaller battery used on the spyder mag doesn't have a big capacity for instantaneous current draw. That is why a large capacitor is used with the board to help maintain a reserve of power to help take some of the power load off the battery.
Originally Posted by vin
Do you have a ULT installed? Maybe you need to adjust the shims in it. If not, then you probably need a ULT to reduce the load on the solenoid.
Except for the Automag in front, its usually the man behind the equipment that counts.