[Barry_R]

Keep your plug gaps on the small side. Pull up on the rotor contact to ensure that it touches the center button. Drill an extra vent hole in the cap to release the ionized air.

MSDs are capacitive ignitions. They hit the primary side of the coil with hundreds of volts instead of the old 12ish. Capacitive ignitions make for short duration and high energy sparks. The short duration is why MSD requires multiple hits at low RPM. But you ignition is seeing more sparks per revolution that you would intuitively expect - hence the accelerated cap & rotor wear.

It does not really matter how much "potential" voltage a coil has, as long as it has enough. Electricity is lazy - if it takes 8,000 volts to jump the system gaps, 8,000 volts is all you get.