Disastor at CMP games vintage match with mk4

[Sunray]

"...cheekbone rests on the thumb..." Hurts like an SOB with a No. 4.
"...virtually unfired..." So you had never fired it before you took it to a match? Shame on you.
Did you check the headspace at least? Even an all matching rifle gives no guarantee the headspace is ok.
"...the stock is so low..." You're holding it incorrectly. Too low on the shoulder. It's also possible the butt stock is the wrong length for you. Butt stocks come in several lengths.
"...no windage adjust at all..." Windage is adjusted with the front sight. Move it in the opposite direction you want the group to go.

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[Parashooter]

"...cheekbone rests on the thumb..." Hurts like an SOB with a No. 4.

Not necessarily. If you have a normal human thumb, examine it and you'll notice a reasonably straight section between the two joints. Align this under the cheekbone and maintain firm contact - no pain required. Of course if we rest face lightly on the pointy knuckle part and let recoil slap it back smartly, it's going to sting a bit.