I shot the G43 against this week. I only shot ~100 rounds through it, but the gun ran fine--no problems of any sort. On that point, it was a good trip to the range, but I was really having an off day. From 15 yards, I shot something like a 45-0x on a B8. I was so disgusted I made an attempt shooting left handed (two handed, but using my right hand as my support hand) and shot a 88-3x, which was both surprising and puzzling. In any case, I'll go back again next week, and hopefully shoot some more from 15 yards.
I use grip tape to give better control of my 9mm Shield. I shoot a 43 poorly. My hands are large, and I think that I would have to modify the 43 grip to do better. You might consider this tactic. My 45 Shield fits me much better. I also shoot it much more accurately,