Need Maggie MG-2C help....

I just recently got a nice pair of these. Very clean, no torn ribbons, and no rattles. First, I'm using a Counterpoint SA-100 amp that's 170 wpc @ 4 ohms. This amp was great on my SMG's, but seems a bit weak on the MG-2C's. Would I be better off with something in the 400 wpc range? Second, I finally got them positioned right where the soundstage is large and has a prominent center image. But to me these speakers seem to be a little harsh in the midrange area, something I didn't experience with the SMG's. So have any of you had this same problem? I was thinking of changing the x-overs, but not sure what to get. Any help appreciated!Thanks,Danton