Thanks for the input. I should have taken some practice shots from my stand, but figured shooting in the yard would be enough. i moved my pins and split the difference. Now from my roof (which is about the same height as my treestand) im hitting about 2" low and from the ground about an inch high. It just puzzles me why the difference. When i moved the target within 15 yards its on, it seems like its that 18-24 yard range that it shooting low.