Yep, 1" threadless carbon fork are rare and those weighing under 400 gms are even rarer. I have Easton EC90SLX forks on two bikes and they weigh 295 grams uncut BUT they are 1-1/8" steerers so that won't help you at all. And, yes, the logos are a bit garish.

Kestrel made their EMS Pro in 1" threadless for a while but it weighed about 495 grams and has been out of production for quite a while.

Nashbar still lists a 1" threadless fork with carbon legs and an aluminum steerer but it's advertises at 580 gms uncut.

Amazon lists a 1" alloy steerer Ritchey carbon fork but doesn't give the weight which I sure is way above 400 gms.

Not much help is that?