I'm too new here to lay claim to any technical definition of HO'ing.  However, I admit that a couple times I have done it, because it looked like the other guy was doing it to me.  I knew what the end result would be, so I just squeezed the trigger and said "I ain't a gonna be the one that turns first, bro."  Lately, when confronted with the last-second realization that I'm staring at a HO, pulling up or pulling right slightly seems to be working for me.  I don't get HO'd as much, nor am I inclined to pull the trigger.  I've also made a conscious effort to avoid co-alt head-on approaches.  I seem to survive and fight more by constantly using low G and low E-draining banks and climbs as I approach an opponent.  But I have no idea if this is the right way to do it.  Intuitively, a head on approach just seems like a poor choice for a first step in the engagement, and not as "the" kill opportunity.  Maybe ping the radiator, that's fine.  But a full bore Kamikazi, guns a-blazing HO run just feels cheesy.