The pan is 7” across x 3” deep? I know that Rose’s cakes aren’t supposed to bake well at 3” deep, but when you posted your question, I wondered if a small diameter might mitigate that—but didn’t feel confident enough to respond. Luckiily, you had ~Freshkid’s excellent knowhow to help you!!
Now that I think of it, this wasn’t a Rose cake, so maybe others’ cakes are more flexible, provided leavening is adjusted. Was the internal texture as you had hoped for?
Beautiful decorating, BTW!