What if Champions level 3 ability increased their crit range to 19-20, and made their criticals hit for 3x the number of dice, instead of 2x? Since flat damage increases represent a significant portion of the damage spread in 5e, this would not necessarily be game breaking, but on average it would increase the viability of crit-Champions without needing specific magic items or multiclassing. Would this be overpowered, or would it fix them?