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This was my observation as well.This is from online manual factory screws and rails.
View attachment 7922849
My experience with DVA screws and rails were the screw heads were too small for the rails holes and would not take anywhere near that torque without pulling through. (It is actually the hole diameter that is the problem, too large for m6 countersunk screws)
They sent me larger headed screws which worked.
Orignal screw head dia: 11mm
Replacement screw head dia: 12mm
Cautionary tale...