I am still tinkering with the thing and it seems to be getting better after doing two things.
It seemed that with the red plastic baffle screwed down tight that there was too much pressure on the top of the charge bar. I backed off on it just a bit.
I am not sure what screw BigJimP was talking about. The UCB is slightly different for a progressive or a standalone MEC. Anyway, I losened the screw on the front of the charge bar, the one attaching the "ProCheck" to the charge bar, slid the bar to the left and tightened it back down. It may have made a difference.
I will know better when I put some shot in the bottle. For now I am out of shot.