That's pretty strange if you get streaks with distilled water. I myself use half strength photo flo. Are you drying it in a heated environment or is it possibly drying too quickly?
Originally Posted by Roger Cole
What I've found is that having copious amounts of surface water+pflo helps pull water off in more uniform fashion due to the reduced surface tension allowing the water to stream off. I don't trust small beads or snapping the film to have as positive effect because its effectively reducing that "stream factor."
Stop worrying about grain, resolution, sharpness, and everything else that doesn't have a damn thing to do with substance.