Nope, I think it was something I was messing up somehow....damn thing is easy, I just wanted go make it difficult. Im going to run it set on 20 and see how many hits I get out of it...worst case scenario I end up getting 2.3u GH vs 2. Should get 9-10 shots according to how accurate it doses. On the plus side, it makes the shot very, very easy!Did you figure out why it was taking 16 units on the pen to get 1/10th ml backfilling a pin?