^^^Hmmm. Were you still getting those awesome 1.5"-ish groups? Did they deteriorate when your hider became loose?
I was thinking of taking off my factory hider and shooting it just with the plain barrel, and saw that you already did it-- still with relatively large groups. I'm frequently getting 2 shots within 1/2 to 1", with the 3rd shot going 2.5 to 3" away (it doesn't matter what order the rounds are shot in regards to the flyer). Other times, I get decent 2 moa trianglar groups (with ball ammo). My reloads have made no difference in size.