All M&P22's shoot high, even with the rear sight all the way down. If you want POA at 25 yards, which is where I like it, install a Dawson .180 FO on the front. If you want FO's front and rear, use a Dawson .160 in front and their FO in the rear. The Dawson sights come with a .040 fiber rods in them. I drilled out the front, used aluminum black to re-color it and installed a .060 fiber rod in it. Picks up much quicker now.
Also, it takes about ten minutes to clean up the hammer (with a sharp Arkansas stone), where it contacts the sear and with a tiny dab of aluminum anti-seize, will drop your trigger pull from 6lbs to about 3lbs.