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Sounds good, then perhaps the props with smaller 15" pitch will give you the low-end punch. I suspect with the size and weight of your Montauk and if looking for a 40 MPH running speed (when needed) you will eventually over-spin the 15" Pitch.

Is there a possibility with a local boat/prop shop you could do a "lend-lease" process to test the diameter versus pitch theory? Down here in Miami, FL we have numerous prop shops that will afford us boat owners this service and in turn they hope to gain a customer which I think is good business.

Do some research on the two types of prop designs Semi-Cleaver versus Round-Ear you may find the topic interesting depending on the weight distribution of your Montauk and if currently stern heavy.

Best,
Angel M.