Ok so you raised the drop rate on the Primal pony mount but these are still not fun to farm. I seen 13 drop since patch 2.4 joining various pony farming parties. Usually when someone wins a pony they leave shortly after making you get someone else who needs it. I have done so many EX primal runs and don't have a single mount to show for it.
I would suggest making the ponies available for like 9 rowen's tokens. That is 3 weeks of doing the weekly EX primal quest for 1 mount that seems fair and takes the very annoying RNG out.