I was playing a local match with a dummy pilot on the second controller (dummy referring to no-one playing it, rather than my friend when he took over for the moving target tests!). Admittedly I ought to run the same tests on an online server just to make sure they haven't somehow changed the damage amount on different servers, but as that's not an option for players hosting a server, I can't see how it would be the case for the official servers.
I don't see how anyone could cheat, without the developers putting in a Double Damage hack somehow. The only plausible theory we could come up with was players getting a damage bonus for higher rank, but that would be really, really dumb! If you have adaptive damage, it ought to be a handicap to the best places to level the field.