What you might want to try for your next adventure is get some of the smaller plastic shot cups. They are for upland birds. I shoot them in my New Englander 12 gauge, and the recoil is much less. Drop the powder charge down to 80 grains and just a measure of that smaller shot cup. It will reduce your effective killing range, but it might not put you in traction. Also since you're going to shorten your killing range, go to a #6 shot and it should add to the pattern for you.

I have a TK2000 and believe me, I am not recoil sensative. BUT I added a RED DOT to my shotgun a couple weeks ago,and was patterning the gun to the RED DOT with full blow turkey loads. I shot it about ten times that day and it was all I cared to shoot. They are brutal. But you have to remember, your shooting 100 grains of powder and a 2-1/4 ounce of lead shot. That's like loading your 50 caliber with a strong powder charge, and the monster of all conicals. So there is going to be recoil. Perhaps a Simms recoil pad would help...

Good luck with your shotgun.