I'm not sure if it will solve your problem, but you could try 10-8 Performance's slide release. 10-8's mag catch is a small improvement and their sights are a noticeable improvement, but their slide release is outstanding. It gives my stubby fingers or thumb enough of a ledge to find reliably under stress and enough purchase to drop the slide easily with a single stroke, but doesn't stick out too far. Mine didn't need fitting to my Springfield TRP but as is often the case with 1911s, it's not necessarily a drop-in part.