It's probably one of the most difficult balances to solve mainly because it is so sensitive and the issues are amplified by the maps themselves as well as the huge lack of team work you often witness. Personally I just suck it up and deal with it, I quit playing HA to 1h shield and now to polearms, I am feeling the HA burn, but I deal with it, I play smarter, I use terrain better, I stick with ranged to protect them from 1h/Lancer cav whilst they shoot at harassing HA's. As annoying as HA's can be I would never want them removed, they are a unique part of this game just like the combat system, even when they're pwning me and I can't do anything about it.