Shooting issues

[TheMadCADer]

I would highly recommend mounting it so that those bolts aren't there right at the exit. There's almost no way that isn't causing a problem. Try bolting through the side walls above the area discs travel through, or the top surface.

Another issue could be that your wheels aren't lining up well with the flat edge of the disc, so they aren't getting a good contact. If you can get the center of the wheel tread to touch the disc on the flat edge, you should get good results.

Also, I'm assuming you've fiddled with compression and motor speed, but if you haven't, that's step 1.