That looks good to me. I use a Karcher, and used to detail my Porsche which believe it or not had much weaker paint than the VW. I'm guessing you mean you a a bottle attachment which sits just below the gun and you put the foam in there right? I would defo put 100% foam gunk in there, then have the Karcher add the water via the gun.
Also, I'm anal as f#*k but I would give the car a clean water spray first... I guess I just like wasting time, but it seems to help the foam work on the nasty bits more closely...
Also, don't leave the snow too long in the sun (not that this is a problem at the moment!)
I can send you my really saddo "detailing checklist" if you like....?