Hakan spuhr should be the last fucking person on the planet anyone should listen to about fastners. He uses the shittiest quality money can buy.
Here is what happens. When you torque down a fastners you are elogating ( stretching) it out. The elastic properties of most steel are usually not very good. In many critical applications fastners have a cycle life of 1, for this reason. Witness marks are not for future install but to ensure the fastners has not backed out, it's a form of inspection.
There are so many factors that can cause issues, saying it's because you need to wet the clamp is pure retardation. Scope issues, scope tube straightness, receiver straightness, rail straightness, the tolerance from everything from a 1913 rail to the clamp, the type of clamp, the bearing surface of the clamp, the size of the fastners, the torque values, how many times you have cycled then , ect ect ect ect. Then add in user error and people are chasing their tails.
When you wet a fastner it generally reduces friction resulting in a much higher torque value than indicated. A properly speced torque value taking into account the material, size and application does not need thread locker. Even in applications where vibration is present. You may have to torque it to the point of it becoming a one use fastners but it is what it is depending on application. Safety wife may be called for due to critical failure risk, but should not be needed all things being equal. I spent over a year running a multi million dollar fastner study for a federal agency and learned more about this shit than I ever want to know. The big one being, most grades and specs are bullshit, and unless you buy from a respectable US manufacture who retains data sheets and certs, you are probably getting the cheapest Chinese garbage yum sim pumped out at the end of his 30 hour shift.
Based on my over a dozen spuhr mounts over the years, I can with 100% confidence say Hakan is a cheap bastard using The shittiest fastners only rivaled by tikka. Probably from the same shitty vendor.