I have printed a few fluoros in the Sericol WB Discharge line. I liked them a lot and didn't ever have that SLIME thing happen.
Unfortunately, our main custy for that specialty line didn't care for the reduced UV performance compared to plastisol fluoros with a full white printer underneath. "Good.... but not great...." or something like that, so we went back to plastisol.
If I were you, I'd call Fujufilm (tech support maybe?) at their toll free number, 800-255-4562. Gail at ext 3568 has had a lot of experience on a print room floor doing discharge, and seems pretty knowledgeable. BTW, she told me once the shirt printing facility at which she worked always started out with fresh discharge ink after the lunch break. She insisted on it. I inferred that the ink is best dumped after around 4 hours. Dunno........