Falls and JLI do have to hit max vet (which takes a while) before they hit full effectiveness. Try this test with all units having the same experience value (think all squads vet 3, maybe jli and falls vet 4, not sure on the experience numbers), and the tests would look fairly different.
Obviously this doesn't invalidate the results of your test, but it's something to think about. When vet levels are comparable, JLI and falls wouldn't do as well.
Edit: That is something I dislike about this test, or more the conclusions being drawn from it: the squads at the top are at the top because this test favors them. Cover engagements favor jli. Max vet for all favors falls and jli. The engagement being at long range works against the jaeger command squad and panzerfusiliers.
