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If you're up for a cheap experiment, keep an eye on ebay for the larger diameter "sailboat" prop p/n 392183 for the Evinrude. I got a barely used no dings one for ~$25 shipped a couple years ago.

It is a larger (9.5" dia) flatter (6.5" pitch) prop with wide rounded tip blades. No way you're getting on a plane with it, but its a lot more efficient at displacement speeds you're able to push your Outrage. I think you'll be surprised at the performance difference into a wind.