Haha. Fire, thanks for setting everyone straight. I got the 9c.
So, I went to the paper target range and put 50 rounds through my 9c. I know that's not a lot, but it was enough to show me that my problem wasn't the sights. I had a decent enough group, probably 5" across and just left of center (something I've always struggled with). Fire, you're probably right about the size of the gun affecting my shooting. That combined with the transition from a 1911 trigger to the m&p trigger (m&p's trigger definitely has a more pronounced break than my old 1911) probably has more to do with it than anything else.
Thanks for the info about your stock sights. Here is a side view of my trijicon's. Looks identical to me. I guess I just need more practice. Thanks again, everyone, for your help.