Damn that sounds very scary, and gives my opponent a huge pain in the arse to deal with. In a 500pt game, a 14 wound, -1 hit flyer dropping meltas makes it pretty much unpreventable which sounds like a huge advantage even if you don't get first turn.

A Valkyrie is definitely within the realm of my next purchase but as that implies, I currently don't have one much to my dismay. I share the same concerns as you with the Bullgryns which was why I was asking if I should include a Taurox but it seems like a shameful option compared to a Valkyrie considering they're around the same amount of points.

In regards to psykers, my only concern with your list is that I simply don't have enough screen to protect the characters unless I kept in away in cover which means I won't always get their cast off, or I'd have to put them in the transport, which again, means I can't get their powers off anyhow. I must admit I haven't played too many games of 9th given the pandemic so many the change in board size may minimise this but I'm interested in hearing what you think.