Stop trying to max your credit score. You don't win any extra prizes for having an 850.
Having a good credit score (>670) isn't difficult. Have a couple of cards, keep your balance under 1/3 of the limit, and pay it on time. That's it. You'll have a 700 in short order. Getting it above 750 is just more of the same.
I get that there are perfectly responsible people who don't leverage credit to gain their needs and then are rejected by the banks when they go looking for a 200k loan. But that's not the world we live in. Bill the Banker isn't the guy whose lived in your community for twenty years and goes to your church. That world is gone and had problems too.
This impersonal world sorta sucks, but I'm not close friends with my neighbors and some of them seem like people I wouldn't get along with anyways.
The real rub of it, in my opinion, is we are subject to these standards without being consulted or, really, considered.
But honestly, don't worry about maxing your credit score.