Your team looks good. I think your pitching especially is really solid. Stud at the top, reliability in the middle, upside at the bottom. That's ideal to me. Good RPs too.
Did you leave out your starting 3B? Or are you playing Johnson there? Do you start 4 outfielders?
The great thing about Utility positions is that you don't have to decide beforehand who you're going to put there (relatively speaking). I think Chris Johnson is a really solid candidate. He's got a shot at batting cleanup in a Braves lineup with some speed up top (one of which is Simmons). I think Revere is going to have a good year, and obviously has speed. So starting those 2 in those Util positions would give you a good balance. See how some of the younger guys do in the onset. Also, take a look at matchups, especially if you have time to set your lineup on a daily basis. But those decisions should be made weekly (or daily) based on who you're playing, their strengths, and how your other players are producing- thus, what stats you need that week.
In my personal opinion, I don't worry much about team concentration. Not to the point that you sacrifice a player for one that you wouldn't otherwise have, anyway. It all evens out in the end. You have good players and concentration shouldn't impact if/how you use them that much.
All in all, your team looks solid. I'd feel good at this point.