Ahhh, the joys of bf running on trails. To me it doesn't get any better (when conditions are right of course). Here are a few tips:
-When scouting out bf-able trails, carry some minimal shoes, i.e. vff, with you. You'll want to always carry them with unless you are certain that the trails are bf-able. Accept the reality that if you want to get the most out of bf trail running, you'll have to live with carrying the min shoes and putting them on occasionally.
-If you have a hard time finding bf-able trails, keep on scouting out different trails until you find some. Trust me, it will be worth it!
-In my area I find that single-track trails are on the average more bf-able than wider fire-road type trails.
-For minimal shoes to carry, I recommend carrying vff or other very light-weight full-covering min shoe, as opposed to huaraches, which I don't like for most trails because they let too much sand/dirt in.
-Try to go bf as much as you can, and learn to judge your tolerances of when you need to put on the min shoes for protection. Don't be afraid to push yourself though.
-Be careful not to focus too much on foot placement (where you step). It's just as important, perhaps even more important, to focus on maintaining a relaxed form and light foot strike, trusting the reflexes and spring mechanisms in your feet and legs to absorb impacts as you encounter obstacles.
Happy trails!
BR