When I used to play late night, and have around a 65 ping to HTC's servers, whenever I would run into a couple of the guys from Japan playing with high 100s or even low 200s pings (so they told me), they would look WAY out of position on my front end when they would get shots on me. It's just the nature of how things resolve themselves on the net. I could take the Pepsi challenge with them, anytime, and know it was one of the two guys I'd see this type of thing with, and it wasn't anybody's fault, nor some sort of "device", software, hardware or otherwise.
Again, film is needed before you start throwing stuff like in the OP out there. HTC can tell a lot of stuff from the .ahf films about what's going on - not posting a film and then throwing accusations (or in a certain case, making up every excuse in the book NOT to release your .ahf films of duels) - says something about the situation.
If you have a specific complaint about a specific player, send the film in. If he's screwing around, they'll catch him eventually.
And once caught cheating, not even Strategic Dominance Gaming Theory can save you.