Pagoda dogwood is lovely, but it's an understory plant. In my experience it grows best when it has shade from the harshest mid-day sun. At the tree farm near me, I often notice the ones growing in full sun do not do well. Just mentioning that because although your spot has shade part of the day, it does have the sun during the hottest and harshest time of day. A serviceberry would likely do better.

The dogwood must never dry out either. The serviceberry might do OK there. Out here I have had bad problems with rust on it. After it started to rust other kinds of serviceberries in the planting became infested. This is not a usual occurrence in my region, I have view quantities of serviceberries both wild and planted here and not ever seen the weird rust nightmare that occurred in the one planting containing that cultivar.

This year I think the shrub is not rusting noticeably (so far) but looks poor otherwise, as though it is going to peter out.

Maybe it is anticipating that I will probably yank it when I get around to it.