ok updates...
i got one of those shell holders for my stock, just for the convenience, and plus the shells in there will make it heavier so it doesnt kick me as hard.
i also found something that may help all of us. i didnt want to shoot slugs through a youth model pardner, mainly because it would feel like a horse kicking me in the shoulder. so i set about thinking how to solve the problem. i found that rolled nickels fit exactly into the hole under the buttpad, that leads to the bolt that attaches the receiver to the stock. i managed to get 2.5 rolls into there, and since they fit snugly they dont rattle around and can be easily removed by taking off the pad and shaking gently.