Tuning for Reliability

[SIGP2101]

Originally Posted by Michael Zeleny

You don't need to increase the mass of the toggle train, provided that a heavy and/or long barrel is in place.

Right, but this is not your case judging by pic provided. My idea, was just to illustrate non feasibility of such undertake. We are talking about serious reengineering of ready made product. Keep searching for right ammo combination or get down to proper load and go from there. This will be the starting point with good indications if any other parts will have to be brought up to the right specs.
If you decide to go with heavier barrel you will be opening whole new can of worms.