Hi Nick,
these are great action shots. Looks like you are really getting into that country posting you are on right now
However, I find the photos a bit dark. Some of that will be due to the time of day, harsh shadows. I also notice that you went -0.3 ev, try the other way, +0.3. You would lose a bit of the shutter speed but you could also compensate for that with highter iso.
Keep enjoying NT
André