#2
personally id do a little low/high cut on the rhythm guitar and boost the mids slightly on the lead, and slightly increase the drums and maybe lower the symbols a db to start but thats just me
#3
Snare can be brought down a bit, rest of the kit up a tad. Lots of room in the middle for vox too, I like it. Might drop some high's off that china too. How've you tracked your drums?
#4
Definitely turn the snare down some and bring up the rest of the kit. Personally, I'd like a bit more attack on the snare, but that's preference. And I agree with take a bit of the highs off of the china.

Though I'm betting you probably want to do this yourself, I would love to take a crack at mastering it for you. Just PM me if interested. I would tell you exactly what I did in as detailed a fashion as I could. I need the experience with a real drumset rather than just samples.