4.3-4.5gr of Clay's under the 200gr 45 caliber bullet of your choice is a standard "power factor" USPSA competition loading. It is a soft shooting load that is more of a push than a whip, which keeps the front sight lower between shots. This load is shot by thousands of USPSA shooters every weekend. I have shot tens of thousands of these myself over the years.
Power Factor in 45ACP loading is roughly 75-80% of most factory loadings. Most guns run this load without fiddling with the factory springs. The icing on the cake with this Clay's load is that it is very clean compared to factory and a lot of other hand loads.
I shot mainly commercially bought molly coated LSWC's, but the commercially bought RN Hi Tech bullets I tried were fat. They ran OK, but unloading was often an issue because the standard 1.25 OAL put the bullets in the lands.
I would certainly test some LSWC's in your gun. Both of my 1911's ran them fine without gun modification. That might be a solution to the .001-.002 of coating you add to whatever boolit you cast.