Something I did with mine (similar set up, aftermarket electronic ignition, ballast resistor and coil) is to put a ballast resistor bypass on start. If you have the right starter solenoid, there is a separate set of contacts specifically for this purpose. One wire is run from the battery side of the resistor to the contact on the solenoid and the other to the +ve side of the coil. If you don't have that type of solenoid, you can test to see if it's worth switching to by connecting a temporary wire across the ballast resistor to start and then removing it when the motor is running. For me this was night and day. Really hard to start without the bypass to a 1/2 second of crank to start.