'RicKrager' - Nice looking 'stock-sleeve & butt pad'. That should soften the blow to the shoulder, a  bit.

Even in hot summer weather, I put on a cloth USMC-style shooting jacket. It has sewn in shoulder and elbow pads which help prevent bruising and pain.

Shooting high-power rifles from the bench is more punishing to the body than "position-shooting".

Some people are more susceptible to recoil pain than others. Although, 110grain .30-40 loads are rather mild for me.

(To tame recoil at the bench, I have a firm grip on the forearm, a 'cheek-weld' at the comb and a good lean into the rifle butt, as I shoot.
I have a firm foam stadium-cushion, that I lay on the shooting-bench and dig my right-elbow into, as I squeeze the trigger. This prevents the rear elbow from taking a beating on the hard bench top).

FWIW:
If your shots are stringing vertically, try loosening your trigger-guard screws and rear barrel-band. Wiggle your barreled/action a bit, making sure the barrel is centered in its channel and the action is flatly seated in the stock.

Firmly gripping around the stock and action with one hand, tighten the front guard-screw "Firmly", with the other hand.

Next, tighten the rear barrel-band. When viewing along the top of the barrel, you may see a thin sliver of light between the barrel radius and the inside radius of the band. This is good; the band is not 'binding' the barrel as it heats up.

Last, tighten the rear guard-screw so it is just snug.  If over tightened, the rear screw will lever or torque the barrel upward off the stock barrel channel and into the barrel-band.

Worth a try, your Krag wants to please!

I have found that raising the front and rear sand bags, places the rifle butt more squarely on the correct part of the shoulder, resulting in less felt recoil.

I always keep a set of Pachmayr rubber Recoil Pads when I go Milsurp shooting. I often shoot 100-200 rounds at a time and would have a huge bruise on my shoulder if I didn't use these.

There are different sizes. I got a small, medium and large and always have what I need for any rifle I shoot, including the Krag.

Lots of good ideas but this works well for me.

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Those 110 grain loads should not be punishing at all.

Position at the Bench should not allow a recoiling gun to "hammer" you. (Hold and Pad as needed)

IMHO - A Krag should be assembled to sit naturally on its bedding at front of receiver and barrel-channel. The rear of the magazine-box should be in contact with wood to serve as a 'recoil shoulder'. Then, tighten front guard-screw very firmly.

Rear guard-screw is just snug ... too tight and it pulls rear of receiver into wood like a wedge and lifts barrel, screwing up harmonics.

I would welcome other views or experiences of others.