I discovered your mod after upgrading to 1.7, so I don't know if this was the case before. The ablator level does not subside or go down during re-entry into Kerbin.
Infinite ablator does make the it easier to play the game, but it sorta feel like cheating. Haven't tested on Eve or ultra-speed re-entry into Kerbin, but normal 2,300 m/s atmospheric re-entries do not deplete the ablator in these airbrakes.
Maybe it's just me, but I'm curious if this is happening to anyone else.