While I can't speak directly to Kieselsol, I can speak to your question on the IPA and dry hopping:
1) Cloudiness due to dry hopping is to be expected, and is an acceptable characteristic of the style. It's actually a very normal thing among dry hopped beers.
2) A couple days in the fridge and you'll find that the vast majority of that cloudiness will drop right out of solution, whether your bottle or you keg.
So, at least for the IPA, I wouldn't add any fining agents to it in your position with regards to the dry-hop induced cloudiness.