OK, I'll try again a different way.
Here are pictures of my20'/30' tube Jack's cat on the Grand a couple of years ago. One is in Granite, showing the kind of rear end flip that the aforementioned Garelick jackass withstood with a 125# Tohatsu hanging on it.
The next is a portion of my turnaround run in Dubendorf, showing the same thing, although in this one I had the motor partially pulled for a shallow section.
The third picture shows the fabricated piece I use to join the jackass to the yoke. It U-bolts onto the yoke, spreads the load across the upper and lower yoke cross-bars, and accounts for the vertical and lateral forces the motor and jackass exert.
Fact is, we are never going to have lab-tested, fully scientifically vetted data to go to, to use in conjuring up these atypical motor lash-ups. That's why those of us who have offered real-world success information are posting here for you.