For clarification, add in that penalties to covering fire stack with each other in the main entry and that while you may designate areas that overlap such as say, using multiple "Double Cover"s to make a wall to stop an advancing horde, that only means you threaten the overlapping areas once, not multiple times.

Consider renaming "Double Cover", "Area Suppression"

Also, can you just imagine the kind of insane AoO speicifc build some kinds of hunters using these tactics would have? Dex based everything. You're only limited by your ammo capacity and AoO rating by that point.

Also, I am unsure of how to really help you on that, but I think perhaps spliting up the abilities that automatically scale from the ones that don't might actually make it easier to organize, perhaps if you want to consider altering the progression from there.