FWIW, Not sure if you are aware that those slapper bars are not adjusted properly on the springs. They may still help a bit, but the snubber should be cut in half and be positioned so that the 1/2 snubber on the end is just about touching the front spring eye. I had to cut the rear perch, extend it and reweld it to get mine properly adjusted.
Once done, you should notice a significant improvement in how well they work.
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