+1 on SLOW. Keep them in the "0", really. An occasional "1" won't hurt your score, but the vast majority of your shots need to be in the "0".
It changed how I carry - for one, I know always carry something I can get a full grip on, in addition to the pup. You quickly notice an increase in sight radius as well. I've also, almost, resigned my beloved revolvers to hunting sidearms, nightstand guns, and things to carry around the house - admittedly, I don't have one of those 8 shot 357 models.
I have a GGI worked over P226, switching to a G17 or my G31 made an immediate improvement on my score.
If you see a jam, it will be a stock 1911. You will, probably, never see a stock polymer gun jam. If you do carry a 1911, buy one from a custom maker, shoot the heck out of it to ensure it actually does function, or, possibly, by a S&W one - my buddy has had good luck w. his, so far. But he usually shoots, and carries, those built by Hank Fleming.
If you want to buy something competitive, a G35 or G34 - buy 40 minor for the G35, is probably, your best bet. The XDs are great guns, but are penalized under to classification system - probably because the triggers are much better than a stock Glock trigger.
I don't know how the M&Ps are classified, but I do know quite a few people are happy w. their pro line.