Big Paulie,
My son and I took Marlin Guide Guns in 45-70 to Canada for a bear hunt in 2003. My son was 16 and weighed about 140 lbs. After the bear hunt in Saskatchewan, we drove to Alaska for a couple of months. We spent lots of time fishing, hiking and camping. We picked the 45-70 for several reasons including the legal issues in Canada, and the ability to have a suitable gun to deal with a grizz if need be. The 45-70 worked great on the black bears. We did not have the need to deal with a grizz which was great from our position.
Prior to making the trip we spent a lot of time fine tuning the guns. We started off with factory ammo. I had a Guide Gun that was ported and I traded it off because it was so loud. So we were both using stainless Guide Guns, not ported. I found it necessary to cut the stock off on my son's rifle because of his size. We also installed Kick-eez recoil pads on both rifles. After we were comfortable with the set up, we started using very hot ammo which I was handloading. After some practice, we bought some very hot ammo - Garrechts, Buffalo Bore and Corbon. We found that the Buffalo Bore was really uncomfortable to shoot. The Corbon was OK. The Garrechts was the best and had the most documentation as to its performance. At the time I was developing all of this information and experimenting with the ammo & rifles, Marlin Firearms had a great website forum. I was on it several times each day gathering info on the different loads. To make a long story short, we ended up buying and taking with us some of the Garrecht ammo. We both practiced enough to be comfortable.
I agree with you that I don't like a lot of recoil. I still shoot some pretty hot rifles (375 H&H, 300 Win Mag), but I have installed very good recoil pads to be sure that they don't hurt. My recommendations are to use the Kick-eez or Limbsaver. Pachmeyer Decellerator is also very good. Getting hurt is not fun. And as I get older, it takes me longer to get over the hurt.
Don't give up on the Guide Gun. It is a great piece of equipment and we were very pleased with them in all of the aspects of our trip. Incidently, I have killed two elk and one whitetail with my guide gun. Just used it as a change of pace.
Hope you get this worked out.
Best of luck & Merry Christmas.
SD Shooter