Question re: the price–so the new barn be $1020+$375 a month? That’s a pretty massive jump up from $675. And I’m sure you might not mind the commute at first, but how will you feel 6 hours from now? Or if your life gets rocky and you’re juggling another issue plus work. It’s a lot of money to be paying for perhaps riding less, even if the care is so much better.
But I’ve ridden at barns like the one you’re currently at, and it’s miserable being in a tiny arena with people who are unable to steer, with poor footing. It really feels as if you’re being untrained (and the horse) if you have to stop all the time and ride so defensively. And the care sounds sketchy.
So I agree with trying the barn with the 8 hour turnout. If the paddocks are as bad as you say at your current barn, being turned out in a nice inviting field for 8 hours might be more than an acceptable substitute.