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Yes, there should be chart, but all upgrades should be x% points of base cost instead of fixed x points.
It's really not the same if you add counter attack for a grot or a MC.

As I understand the idea is to give buff and debuff at the same time and give own character (expl. the assault type with more attack power but less staying power) to a unit not just make it more powerful.
I think it's a good idea.