It seems to me that the best fix is to assign those abilities a rating when they are first used - based on the current abilities of the player characters and taking any narrative considerations into account.
Yes, that does mean that they will tend to get more powerful for free - for characters who have them and don't use them.
(And *that* reminds me of the description of failed mystics - food for thought ?)
-- -- "The T'ang emperors were strong believers in the pills of immortality. More emperors died of poisoning from ingesting minerals in the T'ang than in any other dynasty" - Eva Wong _The Shambhala Guide to Taoism_ Paul K.
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