"perfectly formed" is a correct and usable phrase in written English. You can use it when something (typically an idea, argument, or opinion) has been expressed or articulated clearly and accurately. For example: "My case for investing in a retirement fund was perfectly formed; my coworkers were convinced it was the right decision.".
Small but perfectly formed.
In perfectly formed paragraphs?
Small but perfectly formed fictions.
Bedrooms are small and perfectly formed.
Against them are the perfectly-formed "radiants" who are systematically being exterminated.
And it includes a small, but perfectly-formed range of rucksacks.
Now it has a perfectly-formed grip on whatever it was wrapped around.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com