You are probably the reason TR left this place . I usually pump mine up til the gauge says 35, tho I read that you should be able to press down with both thumbs and feel the rim through the top of the tire, I did this last night and felt a little more confident in the corners.
I'd use a gauge after I got them dialed in if I had multiple bikes, but since I only have one set to set up (pit wheels are just anti-dnf protection), and repeat-ability doesn't really mean anything because even the same course changes over a few hours, I don't see any reason to add an extra step that doesn't add value. I know about where they were for a similar course, so I start there and adjust.
I do own a gauge, I used it when I ran clinchers to set them to the lowest pressure I found relatively safe from pinch flats. With tubulars, it doesn't matter what the number is, it matters that the pressure is right, and that's determined by how it feels, not by a number.