I never mentioned it would be balanced at around 75k/hr.
I stated that I was able to get 75k/hr during testing (pre-hotfix xp-rates) and that I expected players to get higher. I'd be ok with it capping out somewhere around 80-85k but I also have to make sure that the players consistently looting all chests also feel like they are being adequately rewarded.
I'll be making small adjustments until it 'feels right' I know that's vague but when I quote numbers players like to throw those numbers back in your face.
Also the goal of the change was mostly to buff lower floors marginally while making it a static amount of XP for floor completion but naturally providing small buffs to 1,2,3,4 also meant that floor 5 got a larger than intended buff due to people running floor 5 getting the increased XP for all floors