Bullet setback? I haven't had issues along those lines, but I've found that the OAL I use along with the Lee FCD's taper crimp (and I do have to crimp it pretty tightly) are what it takes in order to get reliable feeding in my gun.
About your 3.1 gr load of W231 -- that's only .1 gr away from the 3.2 load of HP-38 that I use in my T380, keeping in mind that those 2 are actually one and the same powder. And I'm not showing any signs of over-pressure, either.
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