How about something real simple...make sure that any liquids contacting the film...developer, fixer, stop baths, rinse...are kept at the same temperature. I use the top of a Tupperware cake cover filled with enough water to surround the chemical beakers and use a thermometer to monitor the temp. I place the canister back in the water between agitations...seems to work somewhat. My best results are with Tri-X and D-76 1:2 dilution(posted 9070 days ago)