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I can't offer much help except to say that your problem is hardly unknown. Few people recognize the stress placed on the slide stop pin and the frame when the slide runs home. It is the slide stop pin that brings the barrel and slide to a screeching halt, after all. Lots of dropping the slide on an empty chamber can make things worse.
In truth, those lightweight guns were never intended for heavy use.
I doubt any fix will stop the crack permanently. One alternative is a steel frame, but of course that increases the carry weight. It might be possible to cut or drill out that entire part of the frame on both sides and insert steel bushings to spread the load, but that would depend on how big the crack is, and would take a real good gunsmith to do the job.
Jim
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