I have a few ideas for how to balance pvp. Firstly, you should increase the amount of creatures that can do damage to stone structures. Things like the ably and does that destroy regular rocks should be abled to destroy rocks in the form of a wall. Maybe allowing some of the other large Dinos such as the Rex or bronto damage stone as well would improve pvp. Second of all, you put out a patch that removed the ability to put c4 on dinos because that was all people were using to destroy turrets, but really what you need to do is put a warning similar to the shield generator so that you can create impossible walls of turrets, that can't even really be destroyed now that this flyer nerf is released, which brings me to my last point. I would recommend allowing certain flyers to attack on the ground, i e the pteranodon and the quetzal, because they attack with their beaks similar to the tapejara and it can attack on the ground. While I do agree that speed and stamina needed to be nerfed, I think that instead of all-out removing the ability to upgrade speed, you should instead put a cap on how many levels you can put into it.
thanks for hopefully reading this giant monstrosity. I love ark and will always play it, but some things needed to be brought to your attention.