I didn't even know there was a 20ft southwind... I had only heard of an 18ft'r. No matter what you do, that deep of a v-hull is going to be tougher to surf. On the other hand, with 2500lbs in it, I'd imagine it'll throw a beast wakeboard wake. Definitely look for a new prop since your motor will be having a rough time pushing that weight around...
For surfing... Get your rear rubrail (on the surf side) down to within 4-5 inches of the water. Run 10-12mph depending on where the wave curls. Start with just rear weight and move your buddy around, Once you have a big wave, start adding side and forward weight to give the wave a pocket. If I were you, I'd put the 750 on the surf side laying across the back, the 400 on the other side beside the motor and just start with that. Have your buddy sit on the sac, then the spotters chair, then the bow, then the 400, and see how each affects the wave. Then add the next sack. Keep adding till you get the best wave you can come up with.
Better idea: Demo the boat for some wake buddies, sell it for 3500-4500, and go buy a supra sunsport that'll surf for days with 1500lbs...
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