Have you tried CP Jungle Grace? The best support jungler out of the whole game too
While what you said is true to a Captain Grace, it doesnt apply to her out of the whole roamer role. The CP scaling on her kit really is impactful once she hits the 200 CP limit.
Shes a sleeper but I wouldn’t be surprised to see her in top tiers for her cp path once theirs a meta to suit her.