OK, so I examined one of the M5s and it looked fine. However it was greased! I don't know why but I assumed they weren't. Loots of incorrect assumptions here, it seems.

While the screw itself looked fine, there were some blackish to the grease, could be whatever, but possibly indicating a damage to the clamp, if that is made of softer stuff than the bolt. But it isn't, right, because that would be dangerous in exactly this kind of situation! (Guy thinks he puts the bolt in, actually sticks it into a hole!)

Anyway I set them to the correct 4Nm.

The M6, to hold the brake levers, I put down to 9, not having an official reading what it should be.

BTW I discovered something with the M6s. A problem is the screw head is touching the thumb, it is too close to the shifter, and it is cold. But there is plenty of room on the other side! Only a little more difficult to operate. The angle is downward but not that much and it is such a long distance comparatively. Perhaps I'll change that next!