Agree EM,
Capt. Card and Pro Pool were both games I used to own that were hard to get that center hole (though isn't that suppose to be part of the game challenge?) I don't use the hot coils, but I do use high tap on the transformer. It can make a game play harder as well since the slings will now be more powerful, but so will the pops. Some folks like that, others don't. I also steepen the pitch as I like a fast playing game.