Final results:
Receive is great in all modes.
All functions work properly with no scratchiness.
Transmit is great in all modes.
Output before:
RF power all the way down - 3w carrier
RF power all the way up - 5w carrier
RF power either way - 43w PEP swing, 18w average.
SSB - 43w swing
Note: Passthrough regulator ran hot in AM.
Output now:
RF power all the way down - 1w carrier
RF power all the way up - 10w carrier
RF power all the way down swing - 23w PEP, 14w average
RF power all the way up swing - 55w PEP, 27w average
SSB - 55w
Note: Passthrough regulator no longer runs hot in AM, just warm. Finals and driver run cool to warm, even when hammering on it.
Owner has already heard it over the air, he's very pleased with how strong it is on signal and how loud it is.