Should you just press the bearings in and leave them with no surrounding grease? Carbon paste seems gritty so I presume you don’t want that anywhere near bearings?

Seems odd – and a recipe for bearings dying quicker, even if they are sealed and have grease inside the bearing itself of course.

Ask the manufacturer of your frame. I checked with mine, and they said to grease.

Thanks – seems I’m not the first to ask this question:

http://singletrackworld.com/forum/topic/headset-cups-in-carbon-frame-greasedry

So synthetic grease is probably the answer.