Not a scholar of languages, but maybe something like "mit unheimlicher Regelmäßigkeit" (with un-home-ly regular-like-ness, read "home" like in "family" -> "familiar").

I would go with “allzuregelmäßig”.

Similar to “allzuschön um wahr zu sein”, “allzugroß” etc.

Thinking about it tactically, I’ll go with taktisch. :) Takt-isch.

uhrwerksmäßig