I would go with “allzuregelmäßig”.
Similar to “allzuschön um wahr zu sein”, “allzugroß” etc.
Similar to “allzuschön um wahr zu sein”, “allzugroß” etc.
Well, then it seems we don’t have any single German word for all too regular anymore :(
My new proposal would be überregelmäßig. Über+adjective is still one word only, post-reform. Sounds strange, but grammatically correct, and still conveys the “unusual” part.