Have you ever tried feeding him at about +9 to see if it'd bring down his Pre-shot numbers?
With those higher numbers, I'm not sure he's quite ready for the trial so it might be worth a try.
Also, you might try this and see if it gives less than the .1....first you'd draw up what you've been giving and if you squirt it onto a paper towel, it should make pretty much the same size spot
Now, try pushing the plunger in as hard as you can and then putting the syringe into the vial/pen (while holding the plunger in) and then just let go of the plunger....see what size "spot" that makes on a paper towel...if it's a smaller spot, that could be a lower dose for you to try. When you "let go" of the plunger, there's a little vacuum that should pull just a tiny dose into the needle