Whether it performs well or not it would be a good data point. Whether it's a "major change" is somewhat murky, depending on whether it has an "appreciable effect" on performance or powerplant operation. I have the older op limitations which say that a major change invalidates the airworthiness certificate, so I'd have to apply for a new AWC with updated operating limitations (and new test area), though I should do that anyway. But I may also determine that based on ground testing, there will be no "appreciable effect". We'll see. It may not happen until next spring, if I still have the propeller at that time. Regarding the AD, I'm not clear on how big a scratch they consider a problem that has to be dressed out? Nicks, yes, but scratches? Only inspection is required on a 125HP O-290-D like mine, but if the prop is on a 135HP O-260-D2 then replacement is required at 500 hours and there is an "avoid continuous operation between 2450-2500 rpm" limit.