45 ACP+P = waste of money.
If you want higher velocities, use 185gr.
Out of a 5" 1911A1, does a 230 gr. .45+P offer significant improvement over standard 230 gr.?
I don't think +P is waste at all in .45ACP, if your desired goal is to get as much energy into the maniac trying to kill as possible. IIRC, that load puts out about 1125 fps and around 550 ft lbs of energy.