Well - I think its fair to say that guns like those import Webley and Scotts are sub-optimal for waterfowl hunting. Between the 2 (1/2 or 3/4) inch chambers, light weight, tight chokes, and splinter fore-end (heavy gloves??), there is little to be desired. Have you written off your Huglu? In a functional state it would certainly serve for waterfowl.
Any SxS is "sub-optimal" for duck hunting. If one wanted to optimize things then likely a 3" chambered modern semi auto shooting Kent TM would be the likely choice. But when someone says they want to shoot waterfowl with a SxS, it's clearly not about the optimization of things. There are other factors involved.
I've spent a lifetime hunting waterfowl...over 50 years......I own a 250 acre duck hunting property at Delta Marsh in Manitoba. I've got pumps, semi autos, OU and SxS. I've never, ever used 3" shells and it hasn't materially affected my take.
I think our OP is in Saskatchewan. I'm from Manitoba. Similar weather. Different than southern Ontario. Wearing gloves is not unusual. It's colder there. The heat generated by the barrels under heavy shooting likely isn't much of a problem.
Tighter chokes are kinda standard for waterfowl, while more open is kinda standard for various types of upland. This may be the first time I've ever heard someone imply, generically, that tighter chokes for waterfowl is a problem.
What you did get right is gun weight. As it relates to felt recoil. That's why some of us have recommended a SxS on the heavier side. But the OP also said he wants an all round kind of gun. Getting the right balance of weight and handling is really only a decision the OP can make. Personally I don't think "all round" and "SxS" fit together. He says he wants to mostly shoot waterfowl. IMHO he should be looking for a big, heavy waterfowl SxS. Absolute minimum of 7.5 pounds and the closer to 9 pounds the better. If he wants to also shoot upland, get another gun.