So if you choose to use this stance, your bonus to most opposed checks will be 1d20 + size + Str + Dex + Feats + weapon properties + magic items. If you specialize in any particular check, then that's likely to be a very high number. And it won't just be for certain maneuvers (like Setting Sun) but for all such checks (for example, if you use Knock-Down or Knockback)
You're correct that Lightning Fox does have a fairly limited play style - you can move around very easily, Bull Rush/Trip/Overrun (with fairly effective bonus damage), and avoid attacks (there are a lot of counters). But when combined with other Disciplines, I've found that it's really quite balanced and fun.
But perhaps you are right. Do you have any specific additions you think I should make to round out the Discipline and make it more flexible?
Thanks a lot for the feedback. It is truly appreciated. If there are any other ideas or edits, please let me know. I'm still very much open to changing stuff around.