i have a custom fork made by orlowski for my pompino and it's 380mm , i always had problem with the seat tube being to slack with a 400mm fork. with the 380 the bike handle muche better for me and the builder said there is space for 40mm tyre.
Do you have a picture?
https://www.pedalroom.com/bike/on-one-pompino-8111
@boredom started
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i have a custom fork made by orlowski for my pompino and it's 380mm , i always had problem with the seat tube being to slack with a 400mm fork. with the 380 the bike handle muche better for me and the builder said there is space for 40mm tyre.