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DWinter, I'm with you. No disrespect intended to those that sell or use trim tabs, but I find the acceptance puzzling. It just seems to me that a properly designed and set up boat will run well as is. My dauntless did porpoise easily last year, if I trim up. At the same time it also ran faster that I expected. I look at the porpoising as a tuning puzzle. I want to figure it out. To that end the motor is mounted as per manufacturer instructions which placed the anti-ventilation plate 5/8" below the keel. I think that raising it a notch or two will mellow things out. If not, it still runs fine.