The only suggestion I'll comment on at the moment is 2. I think the problem is already largely fixed.
First off, since the last nerf, the ratio of HA to HX has gone down tremendously. Before I saw roughly even amounts of both, with a slight HA edge, now I barely see a single HX. The ratio has to be at least 5:1, and most probably higher.
Second, every time, bar none, I have seen someone delaying at the end of round since then, it has been a HA, not HX.