Okay, my 3913NL is a fine shooting machine for a relatively short-barreled short sight radius 9mm. But is isn't as accurate as my Walther PPS. Sorry. I wish it wasn't true. Frankly, my Beretta 90-two is pretty accurate also, a bit for massive for everyday carry though.
The 3913NL is one fine piece of S&W work. Everything you hear about them is true. If you can't find one, and need to get a gun now...get one, but don't stop looking for a good 3913...you won't regret it.
I love all the talk about bullet-jump affecting accuracy, when my S&W 686+ relolver will outshoot them all. Talk about bullet-jump!
To see if it's your form affecting POI vs. POA, use a rest and squeeeeeze the trigger. 10 shots minimum. Don't fall for that 3 shot group or 5 shot group crap. Then at the same distance try it with a two hand hold. Again...squeeeeeze the trigger. This should give you a good idea if the sights need to be shifted. Even taking your time with the two hand hold, if you have a fault, it will show compared to the rested shots.
Jeff