Aha! The problem was the cleanliness of the reels. A locker-mate who may not have been washing them very well, combined with the hard, hard water in this area, combined to form some barely visible deposits on the film-surface of the reels. I never had this problem before...because I lived in an area with soft water! The lime in the water leaves deposits on everything here, but I had never considered it to be the source of my misery! I still need to invest in some white vinegar to complete the job, but just cleaning them well with hot water, detergent, and a toothbrush was enough to get 3 out of 4 rolls to come out perfectly! Cleaning seems the only way to resolve this, as rapping the tank after each set of inversions (as suggested by some)did not prove effective. Thanks for everybody's help!!!(posted 9019 days ago)