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. . . Also, how much does a bracket help/hurt the ride of the 20? I know it is basically a no brainer on the 23, but it sounds like it might be less clearcut with the 20. (i.e. old carb'd 2 stroke on transom versus 4 stroke/DI on bracket). . .
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The biggest difference I noticed was the significant increase in min planing speed. I was able to correct that problem with a 4-blade stern lifting prop and Doelfin. On a positive note, the geometry change with the 25" shaft and 30" setback evidently gives the motor more "leverage" on the boat, because power trim now has much more effect on running angle than it did with the 20" motor on transom, particularly at higher speeds. I believe this effect largely offsets the negative aspects of shifting the CG aft. If you have a large flotation tank on the bracket like the Hermco, that minimizes the effect on static trim, and seems to make the boat less sensitive to folks walkin around in back of boat or on swim platform. The waterline at the transom is within about an inch of what it was with original configuration; it's still self bailing at the dock, by about 1"!
Overall, if done right (big flotation tank and ~ 400 lb instead of 500 lb motor) I think a bracket is a great addition to the 20' hull. Elimination of the splashwell opens up a lot of usable storage volume and seating space in back of boat, and the big platform is great for diving and anchoring close to the beach!