Mine is the same way.Everyone seems to like the top hole. My truck likes the to hole-a lot.I run drag springs and the new calvert 90/10s up front. It's critical for me to get a good weight transfer going. I assume this is because of the inherent forward weight bias most trucks have.
I can also tell you guys from experience that changing ride height via shackles and hangers directly effects the angle of the bar and thus instant center
Tom