I own an 11oo T-Trap since new in 1974, never heard of this problem, when you say your running the gun "wet" with rem oil. do you mean in side the magazien tube?
I had the same problem with one of my 1100 trap guns. I traced the problem to insufficientSwitch to Breakfree CLP and don't leave the gas chamber wet. Magazine tube is fine. Some European shells have an acrid smoke. What ammunition are you using? I doubt your 1100 is worn out.
I would guess low pressure with 7/8 oz making for inefficiant burn and smoke.At 80+ years I have dug out my 1100 trapgun again. Have noticed some smoke from ejection port after firing and the occasional flame over the years. I now also notice that the morning following a night shoot my eyes burn a bit and nose is plugged somewhat. Recently my son was shooting trap with me and commented that my gun really puts out a lot of smoke. I am shooting 7/8 oz.reloads using Promo powder. Have been shooting the gun "wet" with Rem Oil on magazine tube and gas chamber. Recent thread mentioned a dieseling effect in the gas chamber when "run wet". Both my 1100 guns are early flat rib guns with no barrel mods done at all. Is this perhaps a sign of a worn out gun and some kind of blow by?