I had a similar issue with a 13x7. Getting the Indigo 3 blade was a large improvement in motoring ability and made the boat much quieter. Maybe not so much with the Alberg, but for my boat the prop is under a flatish section that acts as an amplifier.
Seriously, if you are out of the water, get the Indigo. Way cheaper and easier than trying to redo the engine mounts and shaft log!
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