Yup- the foam is your friend. There's so little liquid in the phome, you could fill a bottle with foam, then rack your beer into it, and not have it affect the beer (ask me how I know).
I get the slimy texture too. Star san is an extremely powerful acid cleaner- my guess is that the acid is dissolving the dead skin on my hands and making them feel slimy, because I can still feel it after rinsing for minutes and minutes with water, plus my hands are dry and scaled for days after a bottle washing day.