I'm following as well! But, not having high hopes.
What my own experience is teaching me - we are all going to end up buying the Wake Wedge, or pay those boys some royalties, lol.
I've been having my a$$ absolutely kicked with failure after failure testing various surf-modified trim tabs (I showed pics of the "beast" somewhere, that was the best I got - but not good enough). I'm coming to believe that it is going to be exceedingly difficult to design a delayed convergence tool that works with Yamaha hull.
My own
@COtoFLsurf-style flap experimentation brought me back to the original OP design - fairly short, strait cut, and hanging strait down, working best. The only issue I have with it is that I don't like cruising with it on. Especially when my friends get the wheel... I find it very hard to explain why they need to slow the f@ck down. That thing hanging back there is okay at 25mph but not at 45... And then - when I take it off - it is very hard to store.
So, my continued flap-mod process has been steering me towards changing the bracket - to change the angle - so that the flap is out of the water when up on plane and going. But once you do that - you want the flap to be more rigid... See where I'm going with that? lol.
Here is one of my more recent prototypes - ready for the test pad - in theory I can design it to slide along yada yada. But the bottom line is this: if it works better than the rubber flap. which it likely is, I'm going a full circle here towards the wake wedge. In biology, this is called convergent evolution, btw.
(well, at least I can say: "I have tried!" "Now, here is my money, give me that Wake Wedge")
--