Sounds like you have the basics covered for the lenses you need. Don't worry about the 55-70mm gap. In the grand scheme of things it is not big enough to worry about.
The 35mm AFS might be good to have for the indoor shots for the larger aperture than your 18-55mm has.
Your 70-300mm is a great lens. If you are looking for more reach for those 400 yd shots, you are looking at more size, more weight, and more dollars. Assuming the 200-400mm is out of the budget, you might look at the 80-400mm.
---------+---------+---------+ Joseph K Seattle, WA, USA