Hi all. I am brand new to crossbows. I just purchased a TAC 15 elite, and did the QAD HDX upgrade. Started sighting in today, and to get the arrow to hit the bullseye, my rest is obviously too far left. I am shooting at 20yds, and have an HHA optimizer installed. I think it is too far to use the scopes adjustment to fix the problem. Any ideas? what am I missing?