Just a final word of thanks for the guidance on this, to everyone who contributed. The gun has gone from a kind of oddball conversation piece, to an effective and practical shooter. By far the most important improvement was the trigger.
The sights have also been improved with a little white paint. Normally, I like my sights like I like my coffee -- black. But in this case, the narrow blade/notch arrangement was really hurting my speed of acquisition. A bit of white paint transformed the situation. The gun turns out to be surprisingly accurate for a pocket pistol, and I have no trouble keeping cans jumping at 20+ yards.
Also improved the grips -- the wider profile does help to tame some of the residual "blowback 380 syndrome," and results in a comparatively a mild shooter.
Thanks again!