I'm still not convinced. The water/chem drop would have to be enormous (about 1 cm wide). Also, when I pour the dev into my Jobo tank, the tank is in the upright position, so the sheets are horizontal. The chem is poured through the central column (pipe?), so I don't think any big splashes inside are possible. I always load the film into the completely dry tank.

Anyway, thanks for your opinions, I will take another look into it.