Thanks for the suggestion but as a many years experienced shooter, instructor, armorer and LEO I am reasonably certain that I didn't overlook those kinds of techniques and I exhausted many others.
Believe me, I wanted my six 45 Shields to work.
I'm not saying that 500+ rounds wouldn't have solved the issue but I'm not willing to put that kind of money into shooting duty ammo to prove a $350 Shield.
Besides, I never had to do anything like that with my Glocks, Sigs, XD's, Colts or other S&W's.