Always someone complaining about PvP on every forum...
OP, I find that making suggestions works better than complaining. Do you have any reasonable suggestions as to how this can be resolved? Because it sure as hell takes more than just fiddling with a couple of numbers, especially if the game is to be semi-consistent.
Unfortunately citing things like the flier nerf are only going to hurt your case. You know as much as everyone that was a generally needed balance pass, not that nasty PvP harming your PvE gameplay. Much like the original nerf to tame stats, sometimes people forget that the devs simply have the desire (and right) for the game to hold challenge or be engaging. If you want Quetzals that cross the island in 0.5 seconds and one-shots gigas, go develop a mod for it, but it's not the game the devs want...PvE or PvP.
I suspect that motivation for challenge is a large part of what you are clashing heads with, not that nasty PvP.