My suggestion is that once a person owns a 310% mount, all of their other 280% mounts should then also go 310%.
It is sad to have so many cool and unique mounts be effectively useless because only a select few go 310%.
I don't see any possible way this change would negatively impact any aspect of gameplay.
It would directly result in many more flying mounts being legitimized and pursued through farming or the warmane store.