I'm not entirely convinced this is a problem -- but with a caveat, because my experience has not been trouble-free.
I have somewhere between 2500-3000 rounds of 124+P Gold Dot through my two G43s, and have had three (maybe four) failures to feed, nose-in to the ramp. These do suggest slide velocity vs. mag spring. However, all of these have occurred with factory pinky-extension mags, none with the flat baseplate. My working theory is that pinky pressure on the mag might tilt it *just* enough to increase the likelihood of such a malfunction. (Not even addressing the issues I've had with aftermarket extensions -- none of them are trustworthy!)
I no longer have the pinky extension on any of my G43 mags, which suits me fine because it's a pocket holster gun anyway. If I'm carrying on the belt it'll be something larger.
The above being said, now that I am recently retired and issuing my own ammo, I might add a stash of non- +P for use in the G43, although I haven't decided which load and whether it's worth the bother.
By the way, Wayne -- we met last year at the [range of a large northwestern PD] when you happened to be there while we had the advanced armorer class going. Great discussion of pistol optics, thank you.