I think it has a great stance myself. I like both level and up slightly in the rear, but I've always been a bit partial to a tad high out back.
It does seem kind of natural to me then, but I can also understand how you might think it's high. Agree with the others that say drive it some more, see if it settles, then if it does not, you can tweak it a small amount by removing the lowermost two leaves for almost a half-inch drop.
Assuming the Deavers follow the standard operating procedure for spring packs?
But are you totally empty in the back? Do you intend to add any weight to it? What about even just temporarily adding a couple hundred pounds to help them settle?
And yes, every amount of lift will shift the axle sideways on the trackbar. It's just how it works. So it's up to each individual owner/driver to decide whether or not to adjust that back.
I personally recommend trackbar and pitman arm drops even for just 2.5 inch lifts. Most don't think so, but I'm a believer.
Paul