Jim, I'll give it a shot. It's the center shot, that's the problem. If the quad is like my TT rest the center shot adjustment does not allow the rest to get far enough away from the riser.
Mine was maybe 1/16" off, but enough for broadheads to notice. One call to Trophy taker and they knew exactly what I was talking about. The new bar I was given has alot more windage adjustment over the standard bar.

Now with my new Dropzone rest my broadheads (phantoms) and fieldpoints are back together.
I went ahead and got the upgraded bar from TT, might as well.