With the current angle you can see the nebari and shari very well, but the foliage looks a little too overgrown for the tree. (IMO)
If you change the angle too much, I think you may lose some of the root base. It seems to be all on one side of the tree, also....
If it were mine, I would keep the current planting angle as much as possible. Maybe a SLIGHT change would be an improvement.? Just to keep the trunk from running parrallel to the soil line?
I think I would concentrate my efforts on re working the shari, jin, and thinning the foliage a bit. Heck, it might even benefit from a total restyling.
So, my 2 cents....
1.) Jin and shari work
2.) Thin out and possible restyle
3.) Change pot to accentuate the trunk
4.) Slightly change potting angle to enhance eye appeal.
-Troy