Cap- My advice is, spend the time tweaking it. I believe it's the single most personal thing to set up for a game like this, even moreso than how you have your buttons mapped on your stick. The software is universally adjustable, so use it to get it just how you want it. It will pay off.
TrackIR is funny, people either love it or hate it. I can't live without it, I have squaddies who can't use it at all.
What FLS mentioned about the deadband works well for me as well. I have about a 3/4 inch diameter sphere where if my head is there, it doesn't move at all. That doesn't sound like a lot of room, but it's enough, once you get used to it. Also, don't be afraid to recenter the TIR (f12) if you shift positions slightly in your chair and it's suddenly off kilter.
Wiley.