Some will say that if the broadheads are grouping OK, who cares. They say to just move your sights to where the broadheads are hitting. Others will say that to adjust and correct what you mention, it is flying low and left because it is leaving the bow with the broadhead too far low, and to the left. To correct, you should move your rest a bit up and to the right. The point of impact should change for both the field points and for the broadhead but should be closer or the same. Keep moving the rest in the opposite direction of where your broadheads hit compared to the field points until they hit the same spot, and then set your sights. At least, that is how I remember it. Proper spin matters a little and proper bow tune matters an awful lot so start there.