Starting Score: 601
Um, wow. I don't know if I am impressed, or feel bad for you 
But, it's awesome that you have some really high limits and pretty much all of the major prime issuers covered.
I know many might disagree, but I would close some of the cards that don't benefit you. At this point, with your profile, it seems that maintaining the card(s) that give you the most benefit, that you will actually use, would be the most prudent action. I don't think you'll be damaging yourself in any significant way by closing cards that you don't truly use anyway. I have a score far below yours, and do actually close out cards and their history if I'm not using them or the limits are too small. It's kind of stressful managing too many accounts. I try to just maintain a 5yr AAoA, which seems to do the trick for me when it comes to easy approvals for new cards.
And as far as your combined CL of > $400k, I wouldn't count it that way. If you start running them up, there's no guaranty that the companies wouldn't suspend your account at any time if they notice some sudden risk. And when one bank does that, others may follow. Not trying to be a downer, but I think it's a reality.
if you take that list you provided, and add a column called "What I've gotten back from this card this year in benefits" it may help narrow the list for you.
myFICO is the consumer division of FICO. Since its introduction 20 years ago, the FICO® Score has become a global standard for measuring credit risk in the banking, mortgage, credit card, auto and retail industries. 90 of the top 100 largest U.S. financial institutions use the FICO Score to make consumer credit decisions.
>> About myFICO
