RE: brace height issues with fall away rest
My FX has a 7 1/2" Brace height and by pro standards that is a short Brace Height.
I confess I started out with a Quicktune 1000 shoot through and I had little problems tuning it. Then I changed to the Quicktune 4000. It improved my arrow speed slightly and the accuracy to driving tacks.
I can' t say that others haven' t had problems all I can add is that it has not caused me any problems except making slight adjustments to my sight pins.