I understand the point of the adjustable arms, but the shorter length of the radius arm creates a situation with a tighter arc. The shorter arc compared to what is done with an ATV Racing radius rod is where I would think you would get the larger amount of toe change VS the ATVR setup. The only way to reclaim that distance is use an ATVR length radius rod and redesign the upper a-arm to accommodate that rearward shift as well. I am just curious as to how that would affect the entire suspension geometry. The rearward shift would affect the control arm mounts, and play havoc with trying to mount shocks. It would also place the rear tires well beyond the back of the frame.
I like what you are doing, and I had planned to do a LT setup with mine even getting the axles from ATVR, but I had planned on making mine similar to the way ATVR does it.
I'd love to see some more pictures of the suspension with a rear tire removed and in different positions of cycling, and how you mounted your shock at the hub, as well as the upper shock mount.
Thanks for your time.