Spark plug swap on GPU 220

[AirRanger]

What difference/s if any should I expect to see? Stock GPU 220, Holley 500. Pulled Champion plugs gapped.020, installed Denso gapped .030.

 

[Skeeter]

Loading up while long idling.Tried that went back to 20.

 

[glades cat]

Doesn't increasing the gap cause the coil in the mag to have to increase the voltage? Not sure how this affects a mag in general. It may cause the coil to possibly run hotter.
Speed Wheelie, Des Moines, Mike Thurman...I know you guys can shed some light on this.