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How hot do your solenoids get? With Video
WindDrake:
I'd say bring the snubber diodes up to 1N4004's and try again. Your diodes may not be dissipating the collapse currents fast enough, forcing the coils to bleed it off.
You can also try using a 1 Watt Flameproof 100k resistor across the FET (Source>Drain) to see if you can pull more garbage off the line.
This kind of thing is actually really hard to diagnose without a scope, you get into Black Magic territory.
Marton:
Are they still running hot? Any problems with the coils?? I'm about to do the same on a Revolution X cabinet :)