Just to throw this out there. I demo'd a 2018 Max last fall that the dealer had been using for surf nights. It had an extra 2150# over the factory 3000# with the 400. It had the surf prop on it, and had no issue at all 500ft elevation surf speeds. I took it up to 23mph just to see what the wake would look like at that speed and weight. While it was only a demo, the 400 seemed perfectly fine to me and that's how he had it set up for the surf nights. Now the Makai has 1000# extra stock ballast and is 700# heavier dry than the Max. Correct prop with any of them is always important.