I've got some of those on one steel forks I run sometimes, they are a bit harsh but ok. Disc mount wasn't too great on mine either had to get my brother to machine it a bit to get it inline, wasn't an issue till I changed from avids to maguras. I like the handling of the bike with them on.
Tyre wise I run a single ply 2.4 Maxxis Ardent which is the biggest tyre I can find without going crazy heavy (it's about 825g) @ 22psi ish.

