Having something cap out in Epic just means Epic it doesn't blow up in high Epic... I wouldn't worry about removing it, even if it doesn't matter for pre-Epic play. Besides which I seem to remember some Core spells having caps in Epic.
I would also consider adding a note that if being used with ToB and not you classes that the maneuvers are Cha based instead of Int based. I suspect everyone will house-rule it that way uf they aren't using your classes anyway, and it would work better with Age of Warriors I think.