Black Knight, I agree with you. I think you're right that HQ was way over costed and I stopped using him not only as a result of that, but also the release of the Daedelosus.
I have to say though.. still not agreeing on the Skorpius increase. The indirect variant shines against Primaris and I think that's why people are so hot on them right now. Let's keep in mind most of these 'competitive' uses of Skorpius are a bare bones Admech just to leverage that vehicle.
GW has admitted they write certain things to fill MUCH needed gaps for certain armies. That intention is lost with allies (as I believe the case is here).
In other words... how can you charge more for a basic vehicle that is still 'bumpable' in CC and useless when it's the only in direct really accessible by this codex? Then you face Astra, or Tau and it's really borderline useful.
I just got absolutely hammered by Tau. After one round of full on shooting, my opponent saw the range handicap I had and the immense trouble I had doing real damage and ignored them the rest of the game.
I played Necrons and aside from our range being a little more appreciable against them, that opponent also ignored them to no real deteriment to him.
I really can't agree with that increase from personal testing of this vehicle vs a large variety of opponents. Especially since Onager Dunecrawlers feel very dated to me right now. D3 shots is immensely frustrating at this point in 8th.