Dawn Redwood root flare?

[D.D]

Hello!

After my last Dawn Redwood I purchased had such bad root girdling, I bought another 4 inch diameter field grown tree.

While there is no girdling on this one, I'm having a hard time finding an actual flare. I'll attach a few photos of what I'm dealing with.



I'm afraid to go down any more, and the roots showing are rather large. So any advice on what I should remove or leave would be greatly appreciated!

 

[BeatCJ]

I would just cover the highest root.