All 3 of those JAs/JT would be very welcomed without breaking the job. We would gain a decent dmg boost that would make up for our lack of access to march and haste.

I can't think of any additions for Sniper or Hawk Eye Shot as they seem powerful enough on their own.

The only addition I can think of is for Defense Reflex. Maybe have it move the user into the "Sweet Spot" and drop a % (not all) of the user's current enmity? I'm a bow user though so one of the marksmanship/Xbow masters would need to add some input about being thrown into the "Sweet Spot".

Overall 3 really good ideas that I wish SE would really look into. If they don't want to give us access to haste or march at least let us be a job that hits hard. ^^