I reiterate There is a reason to use the ballast and it's not to save the coil. So your experience with or with out a ballast regarding heat in the coil is irrelevant, that's not it's purpose.
As for the effects on what ever, there should be NO changes, that is the purpose of the ballast to maintain a constant primary current with variation in engine speed. That means a stable ignition with no variations related to engine speed.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
