I just picked up a Deadpool Pro and have an issue where the droptarget "trip" isn't working for the center drops. It seems to work most often when all three are up, but if one or two are down, then it never works. The coil fires fine, but it just isn't moving the plate enough to force them to drop. I took a look under the playfield but I didn't see much to adjust. I tried removing the springs and also adding more resistance, but neither helped. Any suggestions?