I clean my barrels often, but I don't admire them that often. I just realized Glocks have pretty awesome barrels. It is like a mirror inside, everything smooth and great. The M&P has nice ramped rifling, so I don't think the throat or rifling is causing my issues because on both barrels they look good.
The residue or fouling starts about half way down the barrel and gets worse the further you go to the muzzle. It seems to foul the groves bad and the lands not at all.
Everyone has been helping so much, I figured I had to do my part so I just got back from getting new Acetone from the store. I am willing to try anything. Fresh batch of Hi-Tek is in the works.
-Steve