You know I've found a fairly good way to avoid the HO, I will never HO another pilot, theres just no fun in that kind of kill and isn't that why we all play? So anyways when the other guy is coming at me and is about 500 or so out in front I start to go vertical into a immelman, now you can't do it to early or your gonna give him a clean shot at your belly, but after doing it for sometime you'll just get an instinct on when to start, I've found about 95% of the time if he is gonna try to HO, this maneuver avoids it, and I will usually end up after I complete a loop in a better position on him for the kill.