I did some test flexing yesterday and it left me a little disappointed. When I climb until my back tire loses traction (below), there is only 7" of the shock shaft showing. That leaves 6" not even getting used.
I think the solution is going to be raising the upper mount a bit, swapping out my 12" bilstein shocks from the back to the front, and then putting my 14" 5150's in the back. That should also improve the ride as I'm running some wore out rancho adjustables on the front.