If you're looking to maximize your FICO scores, you'll want to implement the AZEO (All Zero Except One) technique, which means allowing 2 out of 3 of your credit cards to report a $0 balance while the 3rd reports a small balance. You want this small balance to be 8.9% or less of the total credit limit. This is usually easiest to accomplish with your largest limit card, as up to 8.9% can be a greater number over a smaller limit card, but it doesn't matter which card you use.
What matters is what balance reports to the bureaus, not how much of your limit you use. Typically your statement balance is what gets reported. So, for example, if your payment due date is the 17th and then on the 21st you typically have your new statement generated, whatever balance is on that statement is typically what will report to the bureaus. If you use 30% of your credit limit on any card, that doesn't mean that 30% will necessarily report to the bureaus. It all depends on the timing, when you spend/pay, etc. Allowing 30% of your limit to report on any single card will adversely impact your score compared to allowing 8.9% or less to report.
What type of Capital One card did you get? If it's a standard Platinum, see if you can product change it to a QuickSilver, which would give you 1.5% back on all purchases. That would make it more useful than your Freedom for everyday spend (non-category).
If those are genuine FICO scores that you mentioned, you're on the cusp of achieving excellent scores. With another 30-40 points, you're going to be in a great place where growing your cards will become much easier. If you're not currently doing AZEO and depending on where your current utilization sits, you may not be far off from 730-740 scores right now if you just tweak a few things.
