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The Wake Wedge guys are my heroes, I'm pretty sure I'll be adding one in the Spring, ideally a non-fold-able one w/the actuator (if those are available!), that is a huge and a very practical step. That said, these new twin boats have tremendous potential that is now just not being realized. With the right approach to pump and engine tuning, combined with a hull/deck extension - those could be the wake boats to recon with, overall. I would guesstimate with the twin pumps there is at least 30% power, probably more, currently lost that could be added for low end pulling just based on the amount of prop slippage under extreme load, such as running with one pump/engine (or with a ton of ballast etc.). With some guys already running pretty hefty amounts of ballast, adding another 30-50% would allow to make truly monstrous wakes possible. Just to put this in perspective, when I played with my single pump 190, with a few mods got it to pop on the plane and pull with 1,800lbs of ballast, no problem. Pump efficiency is the key though, and that is a different discussion.
I think those new tab surf systems mentioned (with uniquely shaped tabs -- eliminating the need to list the boat) could easily be incorporated in a Yammie (on top of the ASP-like wave shaping swim platform extension), there is plenty of space at the transom and many have already installed traditional Lectra/Lenco/Bennett/Vovlo tabs that work great.
Ballast is going to be a difficult item to replace, at least completely. I would think the ladder bracket under Yamaha swim deck already looks like an ideal place to mount a Power Wedge-type device, but the issue is with the deck/transom enforcement, and the built quality/ruggedness of Yamaha FRP hulls... One would have to enforce the hull/deck in a very substantial way from the inside to run one of those: