i ahve used various films-kodak ektachrome epp, fuji reala, , prove, all 120 format. dev is rollei digibase kit at 38.7oC for 3:15. i use 250ml of chemistr in a jobo 1520 tank using a plastic jobo reel. i leave the jobo for at least 45 minutes each time before starting the dev process. i always start with a presoak but im wondering if that is causing damage.