I think getting rid of excellencies is a big change to the math assumptions all the other charms are based on to work well. I do agree with the basic problem Grod and Dr M have articulated though.

A big disadvantage of Excellencies RAW is mote efficency. What about doubling down on this by making the Excellency cost 2m per die, 4m per success AND reducing the mote recharge for Exalted from 5m per hour to "you get all motes back after a good nights sleep". That way you can still blow past problems with the excellency, but your not going to get all those motes back within...