I might be a little leery about using photo-flo on prints. There used to be a product made by Kodak called Ferrotyping Solution. I am not sure it is still around, but no doubt you can get the formulary from any of the multiple choices for such things.
As mentioned by others, heat control and speed will be the key to your success with this dryer. One of the screws you are looking at probably is the adjustment to keep the belt moving straight onto the drum. It would be the one that attaches to the roller closest to the front of the dryer, either directly or by another adjusting pin. How old is this dryer anyhow?
Good luck... looking forward to ongoing reports!