Hey Randy,
I am working on BTS. Waiting to hear from them and many others.
Now on the measurements they are 11 inch front tires. Center is 5.5 inches. But make it safe at 6 inch. That is all I do. Set the rear up the same. Even if you run 12 inch tires or not. This way you want to play and try 11's you won't be caught short or too low.
The disc I used in setting up my FX were much smaller. I used the above math. But when setting up my FX I ran 13 inch tires all the way around and gave myself room to run 11's.
I don't know 1 inch in ride height will hurt a guy like you and me. We are too big or tall and there is no fixing that.
My mower sits at 4.25 or so to frame. The tubed Deck is 3 inch.
One thing I did lately is replace the mesh in the running boards with 1/4 inch steel plates. Yeah I know added some 40 plus pounds to my FX. But with that weight at ground level made it run through the corners much better. At 300 lbs. I could tip my FX and it did not feel like my SP when I did it so it scared me.
Now the little bugger dirt tracks like crazy on grass and loose dirt. No more tipping. And with me at 226 now I can't wait to see how much more faster it is.
Oh that one thing should show you something. Drag racing Pro FX racers at 300 pounds and staying right there with them should tell you I have the Horse Power. Sure I can't corner for poop but I can drag race down the straights just fine.
NOW though I am lots lighter. Now we need to see what happens.
Guys like Al and Mike and others could run from me. But NOW that can't hide!!!!
Later
Don
PS As I work on my FX and Prepared chassis this winter I will have mower and mower new pictures. Stay tuned.