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hamrack
M6 screws don't have any more holding power than a decent QR, and the compression applied by a skewer actually improves the fatigue strength of the axle by reducing the peak tensile load as it flexes.
Have you tried a 173mm Shimano skewer? Stock skewers for 135mm OLN are 168mm, but they do a long one for fat dropouts which would probably work with 140mm OLN and thinner steel dropouts.