We're going into our third summer already with our 2018 22SSRXP. Love the boat, but because we use it primarily to travel in a straight line to our non-road-access camp I'm looking to eek out a little extra top speed. It's got the standard 25" twin pontoons. It's powered by a Yamaha 115 VMAX SHO which is rated for 5300-6300 WOT, currently with a 3 blade 13.5 x 15 aluminum prop. Current WOT is 6100rpm and my GPS says about 21mph with 3-4 people on board, which seems low? I was considering going to 4 blade, and have been reading all about pitch and diameter, but when I read anecdotal posts of people trying various props their performance results seem counter-intuitive to what I've read. Our purchase was slightly unique in that we ordered the boat new from a Bennington dealer but the engine was a leftover 2017 demo from a different Yamaha dealer, so I'm not sure how coordinated they were in putting a Bennington-recommended prop on. Any advice for this (or similar) setups would be appreciated!