Renoman, it looks like you've got a couple of things going on. It looks like your pucks are hanging up on the edge of the in-feed chute, so that only the right hand edge of the puck is in contact with the puck burner. And, from your photos, it looks like your puck burner might be bent. (See the small gap below the mounting rail at the in-feed side of the puck burner.) Or, the rails that the puck burner attaches to may be drooping. Or a combination of the two.
What I'd try. Unbolt the puck burner from the in-feed and flatten the flange on the puck burner. (Having the flange tight against the rails may prevent the rails from drooping.) If that didn't do the trick, I'd bend the rails that the puck burner attaches to up slightly. I'd do my best to get the in-feed side of the puck burner aligned with the in-feed chute. Even if it means that the puck burner slopes slightly upward.
A person might also have to bend the outside end of the in-feed chute, the end closest to the puck burner, down a couple of millimeters. So that the outside end of the in-feed chute is even with or slightly lower than the puck burner. This would allow more of the puck surface to contact the puck burner.
Or, you could shorten the in-feed chute just little bit. On my smoke generator, there is a gap of about 3/32 of an inch between the end of the in-feed chute and the edge of the puck burner. A gap like I have would keep the puck from hanging up on the in-feed chute and allow the puck to drop down onto the puck burner. (A puck hanging off the puck burner a bit isn't a problem. I find that even with the air gap between the puck burner and the in-feed chute on my smoke generator, the end of the in-feed chute is hot enough that the puck sitting in that position starts to burn before it is pushed onto the puck burner.)
Another option would be to remount the puck burner on top of the rails. I don't think this would work for you because it looks like the flanges on the puck burner are thick enough that a top mount position would have the puck burner higher than the in-feed chute.
Bottom line is that if you can get the puck more fully in contact with the puck burner plate, I think you'll get a significant improvement in your puck burn.