I am on a similar path, though earlier on it. I'd be curious how you got the Chase cards. Seems like if you did it early, you wouldn't have a good enough profile, but if you did it late, you've be over 5/24. I hope to be you in 18 months 
Always close Credit One at one's earliest opportinity. 
Don't worry a lot about scoring. Getting them out of your hair is much more important than your score.
You're going to want to zero in on that QS1 card because of its fee, not necessarily because of its limit. Before closing it, see if you have any upgrade offers. If you haven't been using it, there probably won't be offers. But if you've been using it every month, there might be.
Because the bulk of your cards were acquired within a two-year span, AoOA (age of oldest account) isn't a huge factor if you close a few. If you had a ten-year-old account, with the rest of your cards being three years old or less, you'd have a situation where you'd want to try to keep the old account. You'd still want to close if you had a card like Credit One. If the ancient card is a no-fee card whose only issue is something like a low limit, you'd likely want to keep it.
That Capital One card won’t grow, whether you PC or not. IMO I’d close it if you’re not using it, especially since you have better cards. If it still serves it’s purpose, keep it or try for a new card altogether so you can get a higher limit.
I'd close it.
The alternative would be to start using it each and every month and continuing to check for upgrade offers each and every month. I was able to upgrade two QS1s after 12 or 13 consecutive months of usage. It was worth the bother for me because those two cards were over a decade older than my next oldest cards. In your situation, trying to upgrade probably isn't worth the bother. But you can try if you'd like.
Well if you just paid the AF, it’s worth keeping until the renewal (at the very least). They seem to like HEAVY spend though.