By shooting 45LC you're jumping the bullet over .500" into the forcing cone, adding unnecessary errosion on your precision cylinder casing bores.
Seems to me if the OP's chambers were as "precision" as we would expect, he wouldn't have extraction issues.
If shooting a few .45 Colt erodes your cylinder, I suggest you get one made of steel, not hard cheese...
Now, residue from firing the shorter cased ammo is another matter. Carbon, unburnt powder, lead, bullet lube, etc, left behind on cylinder walls from the shorter case can and often will cause extraction problems when firing the longer case ammo. The solution is clean the chambers, or only use the longer cases.
If cases don't extract from hand pressure alone, there is something wrong either with the gun (dirty, or rough chamber) or the ammo (too HOT!).
I don't care if it is factory ammo, if you need a rod/dowel to poke out the empties, the ammo is too hot for use in YOUR gun.
Maybe S&W's quality is crap these days, or maybe you got the one "lemon" that gets past QC once in a while. I don't know. But since the OP's gun has other issues in addition to extraction, it definitely needs to go back.
These huge "hyper-magnum" pistols OUGHT to be as perfect as S&W can make them, fit, finish AND FUNCTION. It's what I would expect, especially for what they cost. Always a disappointment when they fail to live up to their reputation.
Hope they fix your gun right, THIS time.
Good Luck