I know what your talking about with the rear vert stabs. I may try that

The wheels are 105.5mm tall but I'm sure with the wear they have received there around 102-103mm however I do have a brand new set that I'll be running next time, so those are 105.5mm.

I was reading last night that the castle versions from the 1512-1717 are rated to 5-6hp. Something tells me that would be the 1717 with that figure but idk. I've always guessed that I'm running between 6-7 hp in my setup.