I'm not sure if anyone is shooting high school (American) football with their Fuji cameras, but I have been for a few years. I shot my first game Friday evening with my new X-T2 and boost grip. Even though it was my first attempt with the camera, I had way more keepers than I ever had with my X-T1.
I was using Zone AF (3x3) centered. I was very pleased with the very short shutter blackout, as this was my major issue with the X-T1. Being able to quickly jerk my camera around to a player and have the focus lock on was awesome as well.
Here are a few samples of tracking a running player: https://burgsports.smugmug.com/Sports/Football/High-School-Photos/2016/Wheelersburg-vs-Portsmouth/i-pHhTc4M/A
Now, if Fuji could just give us a 200 or 300mm 2.8