Porpoising will tend to occur if boat is stern heavy or motor is trimmed out too far. My boat, which is definitely stern heavy with the bracket, will tend to porpoise if I trim motor out to more than about 50% on I-Command gauge, and that's with a good 4B prop with lots of stern lift. How much do you have to trim down to stop it from porpoising? More weight up front would probably help.
What prop are you running? When I looked at that boat it had a Rebel on it but I couldn't tell what size it was. That's a good stern lifting prop, but if that's what you're running, you need one with less pitch, as 5000 rpm @ WOT is way too low. Optimum rpm on that motor is 5500-5600 so you probably need to drop down a couple inches in pitch.
Is engine height correct? (Should be able to see top of AV plate when you're up on plane and trimmed out as far as you can go w/o porpoising.)
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