Heres what I do.
When they come at me HO, I immediately know that they are at a disadvantage. Why? Because as they fire at me, I can manuever into a good position to reverse on them. Most people know this, unless they are the one HOing.
So, as they come at me I dip the nose down, hard, around 1.5k or so, just outside of guns range. As they follow me down, they miss because of the steep dive angle Im at. Then, as they fly over, I just go into a loop. If they extend, I find myself higher than them, and can just do it again if they come HOing at me. Sooner or later they will get bored and move on or just try to turn with me.
If they do a horizontal turn, then the looping puts you on their 6 and it will be fairly easy to get a firing solution.
If they do a loop, just go level and use that time to gain a little bit of E. As they come close, point the nose up and put them in a rope-a-dope.
Its fairly easy to beat the HO. All you have to do is not give and and dont lose your cool if you get a hit or 2 on you.