Sell it and move on to the next gun, life is too short to be married to a gun that doesn't perform as needed.
Put the word out that you are looking for a new set up and see what everyone has collecting dust in their gun safes that they may be willing to sell, this should allow you to shoot the gun before buying.
Ask to shoot other guys guns during practice rounds, see what feels good and what doesn't. I've shoot a lot of my friends "B" guns and some fit like a glove and some don't.
My double barrel on my Kolar shoots to the left, I have learned to live with it but someday I will probably dump it for a new set up. I only shoot trap doubles with the over and under barrel so I know how to compensate for it as all the targets we shoot at in doubles are constant, but it still is a pain in the ass to have to think about it.