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My WR III started doing that...

I pulled it out of the water..pulled the inlet grill off the bottom and saw that the leading edges of the impeller had been mushroomed (last tyme i let my aunt borrow it)..

I took a course then fine file to it (carefully so not to hurt the housing) and cleaned up the edges..

This immedietaly fixed the "over-rev..under-accel" condition i had..

And only took a min or two..per blade

Might be something you can try..
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