Could be a little form prob. You might be short drawing the broadheads-- not an uncommon thing.-- which can have varing results -- hitting left could be one of them. Also make sure the broadheads weight the same as field pts. you use. Wt. variances at the tip of your arrow can significant effects. Also some times broadheads can plane, and do strange things. Personally, Iam a big fan of Big Feathers--I use 5 1/2" Bananna cuts-- Another thing you might check is the orientation of the BH to the grain of the shaft. There is hardily ever a pat ans. to these kinds of quest. Too many variables, but nothing you can't solve w/ experimentation. Good luck- you'll get'er figured out.