I do appreciate the feedback, but I'm not going to touch growth rates at this second. This would require a massive overhaul of the entire game, and unless I see that it's becoming a major problem with balancing, I'm going to hold off on doing that and focus on newer content. I know this sounds like I'm potentially kicking the can down the road, and to an extent I am, but at such a time I'll be far better equipped to understand what works and what doesn't for enemy stats. If that time does come, I'll come back to this topic and look at these proposed growth rates as starting points, but I won't just straight lift them - some of them conflict with my vision for the character (mostly Sylvie and Lily), and I'd like to refine that when possible rather than completely rework the character.
So, yeah, I'll probably come back to this post later, but until it's a problem I'm going to stay the course and revisit the topic when it's becoming an issue and when I'm more experienced in design and better understand what makes people frustrated and what doesn't.