Well, I tore into it this morning, and I think I found the problem. The billhook on the left side looks like it may have been replaced, and it is different than the right one. The right one has a deep slot for the tooth on the end of the billhook to fit into, the left one doesn't. The clearance on the right billhook is very tight, the left billhook is over 1/8" open when in the home position. The roller on the left billhook is destroyed with two flat spots worn into it. It looks like someone took a billhook out of a different baler and installed it in here. Even the stem it spins on is a bit too long for the frame, as the round part of the shaft sticks out of the bottom of the frame about 3/32" whereas the right side is flush. I don't know what baler that billhook assembly came off of, but it isn't right for mine. Now I get to see just how much I get to spend on that piece....

I want to thank upstate ny for the tip.  I was checking to see if I could file the edge down when I discovered the major difference in the gap on the billhook.  Somehow I missed that up until this point.