First, like any other 1911, first find the load that is accurate and feels good. Then, get a set of Wolff springs and determine the spring that cycles the slide fully.
Changing from 125gn to 158gn can easily be a spring change right there. Also, after firing about 400 rounds, parts are burnished and things start working better.
I found a 150gn FMJ with 16.0-17.0gn of 296/H110 and a magnum primer was quite accurate.