It's probably not the advice you're looking for, but in terms of working on FICO positives, you're doing fine currently and just need to hang out.
You have 2 revolving tradelines, and an auto (installment) loan, you might do a little better with another credit card but it'll be something of a wash. You can attempt to write some Goodwill letters to Capital One, but I don't know how responsive they're going to be. Eventually the accounts you settled will age out.
What you might consider doing, is there's more and more lenders offering secured products which graduate, but they also offer a rewards package one (NFCU, USBank I think graduates not sure, and now BOFA). This is sort of a backdoor into a prime card other than the AF might be different. I'm trying to get ahold of BOFA today to do what other forum members have recently, and seeing about getting my secured card switched over to their Cash Rewards (which is no different than their prime version of this card, just still secured) and that actually turns it into a pretty good card for the long term when I'd originally just planned to drop it in the sock drawer once I got approved for a rewards card from literally anyone else.
I don't think it's something you have to do, as you're doing about as well as you can currently FICO wise in continuing to make ontime payments, but it is a shortcut for me, and possibly for you as well.
I would say that you are doing well. Do you have any military affiliation? If so you may be able to join usaa or nfcu who are great to work with as far as products for rebuilding. If not check and see if you are eligible to join any local credit unions to build a relationship with. They will be likely to issue a major cc after the banking relationship is established. Their interest rates are usually much better than major banks and in some cases they may be more forgiving of past mistakes when deciding whether to issue credit to you. Otherwise, just continue to pay your cc accounts and car loan on time. Time is your friend, and each payment you make on time will improve your score. You may look into getting a secured loan, as installment history is weighted somewhat more heavy than credit card payments in determining your score. Also, if you have any stores that you shop at, such as amazon.com, old navy, wal mart, lowes, or jcpenney... A store card could likely be added to your wallet at this time, to help your mix of credit. GECRB is one issuer of retail cards, and the criteria for approval is less than for a major bank major credit card.
FICO 9: 
Filed Chapter 13 on 6/1/2017 after job loss. Discharged 6/1/2022.
Goal: Gardening!
Filed Chapter 13 on 6/1/2017 after job loss. Discharged 6/1/2022.
Goal: Gardening!
Yes, I would totally pay down your balances to less than 9 percent of your total limit. This will actually boost your score and help you get higher initial credit limits, especially on GECRB store cards
FICO 9:
Filed Chapter 13 on 6/1/2017 after job loss. Discharged 6/1/2022.
Goal: Gardening!
Filed Chapter 13 on 6/1/2017 after job loss. Discharged 6/1/2022.
Goal: Gardening!
Also, don't apply until you are sure that the lower balance is actually being reported, your credit reports usually only uopdate your balances once per month, so it may take several weeks for a credit account to be reported with a zero balance after its been paid.
FICO 9:
Filed Chapter 13 on 6/1/2017 after job loss. Discharged 6/1/2022.
Goal: Gardening!
Filed Chapter 13 on 6/1/2017 after job loss. Discharged 6/1/2022.
Goal: Gardening!
You're doing great 
keep up the good work and your score will definately reflect your efforts!
keep up the good work and your score will definately reflect your efforts!
FICO 9:
Filed Chapter 13 on 6/1/2017 after job loss. Discharged 6/1/2022.
Goal: Gardening!
Filed Chapter 13 on 6/1/2017 after job loss. Discharged 6/1/2022.
Goal: Gardening!