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[Breakin Away]

So I suppose these are all signs of an over sized Prop...

It's over-pitched, not over-sized. A prop shop can adjust the pitch of your current prop, although going from 12" pitch to 9" pitch may be more than they are able to do. You might want to inquire about this before launching this spring.

Note for others: Never purchase a prop with larger diameter than the factory spec. Its clearance with the hull is carefully engineered, and an oversized prop may cause vibration, cavitation, or worse.

[Ron Hill]

Guys : The Michigan Wheel "sailor" props have a much larger cord (& surface area of each blade) than the Catalina Sailor props made in Australia. So It's impossible to compare them, so I'll guess that "Breaking" is correct - that you are lugging down the engine.  You need to get a picture (or an actual prop from a friend) of a Catalina Sailor prop and take them to a prop shop and see if your Michigan can be down pitched to match the resistance produced by the 3 bladed Catalina Sailor??

The best prop shops will have  "Prop Scan" capability!!

A few thoughts