I have seen a few squibs happen in carbines shooting way to light of loads. Those loads worked just fine in 4 inch barrels. They got stuck in the carbines. Load a standard 147 grain load they should work just fine.
Also have you tried shooting standard 115 grain factory loads to see, or rather hear the difference. I know from shooting a suppressed Glock that a friend owns that it was quiet with standard WWB ammo.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.