Clarksville Elite in Clarksville, TN has a pretty good optional program. I think it might be a little on the smaller side, at least the upper level teams, I'm not totally certain though,
Let It Shine in Franklin, TN is a really good gym, I think they have a good sized optional team as well.
Intrigue Athletics in Lebanon, TN has some really great, I think pretty universally adored coaches. Not sure about the current size of their team, but it's worth a look.
I can't really provide you with any more details than that though, but hopefully those names are of some help.
The Tennessee Gymnastics community, from what I have seen, seems really great with lots of friendships and support among different teams. Best wishes!