James, I had a similar set up for a traction bar. What I found that when it flexed, it bent the springs.(Traction bar stronger than the springs) When the springs drooped down, they become shorter, center to front mount. When the compressed up, the springs become longer. Movement either way the center of the spring to the spring eye changed. The traction bar did not. That's when my springs bent. To fix it, I had to mount a shackle(just like on the end of the spring) so it would be able to move to counter the spring length changing.
I know hot rods used a similar set up, but the springs didn't have near the movement as a trail rig.
Hope your experience is better.