[Bushwacker]

My boat was not prone to porpoising until a repower increased motor weight by ~130 lbs and moved it 2.5' aft on a bracket. I would never consider a bracket if you're already having a problem with the motor hanging on the transom!

Besides a fundamental rebalance, like removing the kicker and moving batteries and baitwells, I'd try a Doelfin or equivalent first, as that and engine trim are probably the strongest medicine. A stern lifting 4B prop will also help. I tried a Mirage Plus 3 blade and a 4 blade Michigan Apollo; the latter was much better. On my digital trim gage (where 0% is all the way down, and 100% is full up, just before tilt kicks in), the Mirage would porpoise at any trim setting higher than 50%; the Apollo won't porpoise till you get up around 70%! All of this testing was with Doelfin installed, as that was the first thing I tried. It seems to amplify the effect of engine trim and will also drop your min planning speed.