Sounds like you had a good morning even if you didn't connect with a turkey.
Given the choices you have,I would choose #3. The two fields separated by a row of scrub trees. I'd find a spot to set up on the lower end in the scrub where you can watch both fields. They will most likely come into those fields from the lower end and move higher to find hens and strut their stuff.
My personal rule is to give another hunter,already set up before me,plenty of room. Hopefully the courtesy will be returned to you if you are set up first. But that's sadly not always the case on public land.
And yes,they are turkey feathers.