My Taurus 1911 had some hammer issues and a faulty grip safety. As a gunsmith Taurus offered to send me a grip safety, but two years later I still don't have it. I installed a commander style hammer which solved the problems and a new grip safety from Brownell's. Little of the original gun is actually left as I have changed out the series 80 components for Cylinder and Slide parts, new levers, grips, sear, and recessed the barrel into the bushing ala the new S&W E series. I have several other Taurus models and they always shoot fine for the price.
On some other PT1911's I have worked on the factory over travel setting is a little generous and will allow the hammer to drop into its half notch under recoil. Tightening up the over travel usually solves the problem.