Yep, that would probably move more air.
Complicated system, probably a dozen things that could cause a drop in air flow. But yeah, to me ... replacing a 50 year old motor is a nobrainer. Could be older motors need that extra voltage cause they are 50 years old, old brushes, old bushings etc. The OEM motor I was testing came off a low mileage car and has been in storage for 30 years so it didn't see much use. Other people with a motor with lots of time on it might see a good increase with a new motor, could be the reason some are very happy with a new motor.
Wonder if high speed setting uses no resister spring at all, or if it's limited? Just thinking, if so, quick fix might be to just rewire to send full voltage to the motor. I was impressed with the volume of air moved .... but then I was using a direct connection to a battery, no resistors.
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