SOME of spld's 1911's have fully-
supported barrels, and it's a very minor smithing job to fit one. Advertise on Home Gunsmithing Forums, (Roderus Custom Gunworks) and someone will sell you such a barrel, for $50 or so. Any smith should fit it for you, for $50, or a bit less.
They LIE when they tell you .45 Super brass is ANY thicker than R-P .45 ACP brass, by the way.