Here's my attempt at tightening the door. Heated up a flat head screwdriver and melted slots in panel. Drilled holes in inner aluminum support. Tightened ziptie. Pulled them right in. I know not everyone agrees with the ties. I'm good with it. Can always go with bigger ties, and more of if need be.
That's pretty much exactly what Polaris is having their service deptments do to fix the doors. I had it done on mine and it helped a lot but I'm going to put some nice bolts and washers on the inner panel and tap it into the aluminum frame.