Mike: I have to hand it to you too...beautifully made rifle. The wait was well rewarded.
Regarding the shooting issue, the drop at the comb is critical for a rifle that won't punish you. I suggest that the drop at the comb needs to be around 1 5/16" minimum to about 1 3/8". Yours looks to be around 1 1/4". To compensate for that you are going to have to alter your shooting form, for this particular rifle. Try this: stand perfectly straight, rifle in hand, and pick a target on the wall. Bring the rifle to your eye without changing your stance, lowering your head, or moving in any way. This will cause the rifle to contact your face much further back on the buttstock, than if you drop your head down to align the sights. If you can train yourself to shoot this way, the rifle will not hurt you. Where the rifle contacts your shoulder too is important. Your right arm should be parallel to the ground, not dropped down at the elbow. Let the butt plate come into contact with the arm well inside the shoulder joint, resting against the shoulder chest muscles instead of out on your arm above the bicep muscle. This will force the rifle forward allowing you to get your face weld further back on the buttstock, away from the comb that's punishing you.
I see a lot of people mounting their rifle like it had a scope on it, crawling up the buttstock toward the comb. That is not necessary nor is it advantageous, and creates problems such as those you are having.
Again, congratulations on a lovely rifle. As an old timer once complimented me regarding another craft project, saying: "You have the knack!!"