I shoot trap with an 1100. I have gone back to it after flings with pumps, O/Us, single barrels, and other autos. Because it has less recoil. Its qualities include gas operation, weight, and stock fit. I think the 1100's gas system is more effective in softening recoil - Beretta fans are free to disagree. Remingtons are pretty heavy and you can always add weight, up to the most you can handle for a round or an event. I think plain weights added to butt or mag tube are as effective as the various gimmick recoil reducers. I am comfortable with the factory stock plus a thicker recoil pad to add a little length. I now have one of those angle adjustable butt plates, but don't think it makes a whole lot of difference. You might need that, and/or an adjustable comb if your build differs from me and the guy who designed the stock.
I could not tell any difference in recoil from lengthened forcing cones. I have not shot a strongly overbored gun. I think barrel porting is worthwhile.
Ammunition can matter. Discount house dove & quail loads are down to 7/8 oz of shot, with cheap wads and a 3 1/4 de load of fast burning powder to try to function autos in spite of the light shot load. Powder is cheaper than lead. They are loud, hard kicking and pattern poorly. Extra-Lite target loads, 2 3/4 de 1 oz of shot, will probably function a clean 1100 and have harder shot, softer wads and more progressive powder. Recoil is a bit less, patterns are better, and the hulls are better for reloading.