You have to sit down and take a few lessons from Ruby! Seems like she knows what she's really doing! LOL
I spend forever (well, that depends on the horse) to get their head down and out of the air.
If you watch a horse walking down the trail and it's got his head way up in the air, watch the way they move. You'll see that the back is down, and there is no roundness to them at all.
Most of these horses are moving completely off their front end, thus never engaging their hind end, and does not build up that butt and back muscle, giving them a poor topline.
I've also seen a few who keep their heads up then spook, throw it higher and end up smashing their rider in the face (Sorry FGR - I did get a laugh from that old Darkdrift memeory!). Not a pretty sight.
Most trained horses will move with their head parallel to, or slightly above, their level with their body - which is where a relaxed good horse will keep it.
Seems like you've got a really good girl on your hands. :)