Ockham's Spoon

You could set caps at the beginning and then raise the caps at a steady rate, say +1 to max CV per 50-100 xp, +1 Dc to max damage per 50-100 xp, and so forth. This keeps people from just plowing all their xp into more damage and more CV.  You can also make sure that noncombat skills and interactions are very important in the campaign, and scale those challenges up as well.  So maybe the heroes have to put 10-15xp out of every 50 into noncombat stuff.  

If you have Fantasy HERO 6e handy, there are a couple of sections that offer suggestions (very broad suggestions) on these issues:
p. 108, for several pages, discusses characteristic maxima, ranges, and specific rationales for cultivating certain characteristics in various situations.  p. 390, for several pages, discusses character guidelines, effectiveness caps, ranges, and growth, etc. I assume 5e discusses the same things in roughly the same spots, but I only have 6e handy. It’s not extensive, but it is a handful of pages that summarize much of what has been offered above by everyone else. He layout isn’t always the most friendly, but the information is usually in there somewhere. I’ve toyed with other layouts of information for teaching purposes, but no matter how you do it it still amounts to drinking from the fire hose while simultaneously jumping onto a moving merry-go-round!
 
I hope this helps, at least in terms of explaining where the material is. Whether it’s enough is another issue. 

If you're always the smartest person in the room, you should probably get out more.

Just because you're the smartest person in the room doesn't make everyone else an idiot.

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