congratulations you got what you wanted.
now lets hope this isnt to the detriment of the game.
It certainly wil be to the detriment of the lategame balance.
I don't know what gives you the idea that a cap slightly higher than 10 is going to somehow destroy balance. Seventeen, items notwithstanding, is when balancing a game around a full party of equal XP (or in a milestone game) gets tricky without throwing narrative directly out of the nearest window.
