Uh huh... I thought you meant you shot spots with your field points after group tuning the bh's...
In that case, I don't know what to tell you except you didn't have something right. Centershot off and causing the arrows to fishtail and plane off, not enough fletching to control the head, a little light on spine... something. Whatever it was, it had to be pretty consistent to group well at one distance and go down the tubes at other distances, closer and further.
If I had a setup that shot 8" groups at 70 yards with broadheads, I wouldn't have touched a single thing! <img src=icon_smile_wink.gif border=0 align=middle>