RE: QAD Ultra rest / HCA Speed Force Problems
I take it you are using either the LD or HD Ultra Rest correct?
I shoot an HCA Iron Mace (2007), and I use an Ultra Rest LD model. I haven't had any issues at all with it. If you have the LD and you are getting bounce back, then something is broken in the rest, because the LD has that second spring that locks it down... which is what LD stands for.. Lock Down. HD has the same thing. The Hunter model does not have that feature, and it can and will bounce back.
Are you getting bounce back contact.... such as having vane plasic on the face of the launcher arm and getting black streaking on the underside of your hen feathers? Or is the rest not dropping at all and blasting both your hen feathers off? Knowing exactly where it is contacting will probably help diagnose the situation and lead to a solution.