Ive enjoyed using this form a few times myself, and so rarely if ever see someone else employ it, that your subtitle drew me to check it out. Well done.

Since it's four tercets followed by a couple, it occurred to me that it's a neat form to merge with what others have called a haiku sonnet, I mean, what's a sonnet without rhymes, right? Here's one if you're interested https://medium.com/@marcus17043/haiku-sonnet-for-my-friend-jason-c64fafec763e

I've read that the couplet can be either EE or AA, I usually stream that latter way