Guys, we need to find a way to consistently be able to get enemies through small doors. Anyone got any ideas on how it could potentially be done?

Depends mostly on the controller used, but you generally continuously keep looking either up or down, and you try to make left / right moves that lasts for only one frame. More than 1, and the game re-position you to the boundaries, so it's really that tight.

For consistency and hand-stamina, I'd suggest not spamming the buttons. About the precision part, it maintly comes from personnal experience, and everyone has their own methods of doing it.

As far as I know though, there only are a very limited amount of places you can do it, and only one of them is useful for anything (That's for the newer 6-1 skip).

Also if you want to discuss more about the game in a somewhat more active place than here, I'd suggest joining the Klonoa Discord server : https://discord.gg/GBdmpQ