As a suggestion for filming work, Look into buying an High Vis Vest and wear it in the field. I find that wearing one helps avoid being shot by trigger happy players who can not identify there targets in the heat of the moment or simply too lazy to look. I have done allot of camera work in the past and this does help keep the "getting lit up" to a minimum.
Also try different angles to avoid in coming fire while filming and keep your distance from players as this tends to give away there position during the scrimmage. Use zoom when you can to get the best shots while avoiding flying BB's.
So far your Video's look OK but ,you will find your camera skills improve over time and you will get the results your looking for.
Have you watched other video's like Scoutthedoggie or Six4's on Youtube? Watch how each one does there filming and there technique's on how they go about them. You might learn a thing or two.
Best of luck
Cheers