No data w/r/t MoPar cranks, but factors on regrinding other makes:
1. the drilled oil transfer hole is slanted in the journal, and is uncovered with a big undersize - lost OP
2. the grinding didn't use the correct cheek radius, too large (not enough metal removed) will bind the shell
3. crank stiffness is reduced by both the extra stroke and smaller journal, typically small enough not to matter. Read more in my article: http://victorylibrary.com/mopar/journal-c.htm
I wrote an .xls spreadsheet to compare the actual (intersecting lenses) overlap area vs. nominal (diameters compared) area, e-mail for a free copy.