Well, first PM if you want to sell the 42. Seriously.
I have a 43 that I've shot the s@#t out of and I really like it. All my mags wear the Strike Industries +2 extensions and they blend very nicely with the pistol. That addition alone might solve your problem.
At one time I was invested in S&W's - I have three remaining that I don't shoot as often as I should - an M&P 9 gen 1 that has never givien me a lick of problems, and an M&P 2.0 5inch in 9mm which I used for action pistol. That pistol was a workhorse. They don't get shot much at all anymore.
But to my point - I just flat like shooting my Shield 9mm. It's funny how some pistols are just like that - that Shield, my Ruger LCP, and most .22 pistols always bring that goofy grin to my face.
That is a roundabout way of saying that a Shield might be worth looking at.