It is obo really motivated.
No, I did not tighten the screw with a wrench. I remember now that I am supposed to. I will add/remove shims as you instruct, then tighten that screw.
Did you tighten the rear field strip screw with the allen wrench? Take all the shims out of the L10 and put 2 shims in the ULT to start. Try that