Cool, 5 replies in an hour. Gotta love it. Not sure if the Heavy Duty Starter or Heat Shield really did any good. I think the Heavy duty Solenoid did help. What I'm reading here is that the heavy duty positive cable might help, but I would bet that a good Solenoid along with it is the main thing. When you take them apart you can see the burn on them.
I'm going to start looking for that heavy guage cable.