The root I am seeing looks quite small... Not a big deal if it does not make it. If that is the one I am referring to, I would just add some mulch.

Looks fine to me. Between setteling of the lighter pot medium, a little mulch, a little compost.....

I've always erred on higher rather than lower

just add a bit of soil, plants often settle when freshly planted.

Mine is worse than yours. I don't think I planted mine deep enough or the soil settled and exposed some of the roots. I'm actually waiting for the leaves to fall off and I'm going go in and add more soil to get all the roots properly covered before freezing temps are here.

Between the hopefully (light airy peat/bark) potting mix of the plug, it should drop. And that smigen we speak of, compost, mulch or whatever especially in 3-4 months time , it should be okay either way IMO.