Dumping the FBO timing advance plate.
So after reading all of this I went ahead and bought one anyway. But with the OP issue in mind looked closely and noticed that the inside edges of the slots are not very smooth. I used a small file and worked the edges (especially the right side, thanks Mattax) to ensure the pins slide freely throughout the range of motion. I can't say it is/was TrailBeast's issue but it might at least contribute to an erratic advance curve. Let me see if I can post some pictures with enough detail before I filed it...
So after reading all of this I went ahead and bought one anyway. But with the OP issue in mind looked closely and noticed that the inside edges of the slots are not very smooth. I used a small file and worked the edges (especially the right side, thanks Mattax) to ensure the pins slide freely throughout the range of motion. I can't say it is/was TrailBeast's issue but it might at least contribute to an erratic advance curve. Let me see if I can post some pictures with enough detail before I filed it...