I guess I needed to do the photo differently!

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They get wider in full sun. Your tree looks like its quite shaded.

A.triflorum is one of a few trees that gets decent fall color even in the shade.

Good looking tree you have there

Deciduous trees naturally grow in dense stands in the forest. As these trees crowd each other and shade the lower branches of neighboring trees, they develop a narrow, upright growth habit. However, when a forest tree is grown in the open such as in the middle of a yard, unpressured by competing trees, its crown shape is no longer limited to an upright shape and can become broader and more spreading. Where is the tree located in your landscape?

Thanks for the comments everyone. Don't get me wrong. I love the look of this tree! I liked it so much that I purchased a second one early this year that's planted about 25-30 feet from this one.

The trilobum in the photo is in a somewhat open area, but the afternoon sun is blocked by a silver maple that's no more than 40-50 feet to the west. It's at least 75 feet tall, but the largest branch that extended to the east was removed a couple of years ago. In the not too distant future, we'll need to remove that silver maple. That should help matters.

That largest tree to the right of the trilobum in the photo is another silver maple with a narrow crown. There's nothing to the east or north and just a single 25-foot-tall burr oak about 40-50 feet to the NE. My three C. florida and a C. kousa in similar situations have all spread nicely, unlike the trilobum.

As I mentioned, the color this year is the best yet. In the past, the color has been washed out. Not bad, but not as spectacular as this year. Hopefully, this is the look we'll see every autumn from now on.

There are two future main branches visible that are not erect.