The problem with height advantage is, as I see it, twofold. One, that it grants advantage, a +5 bonus, which is a lot. +1 or +2 would be much more fitting. Two, that lower height also grants disadvantage on attacks to you, making it effectively +5 to hit and +5 to AC. Similarly to #1, changing it to +1 or +2 would be better.
Or just removing one of the bonuses and make you either get an attack or AC bonus from height (preferably +1 or +2 instead of advantage).
