Personally I don't see a problem with Mac's & BWs.
I am surprised a 180wpc amp won't drive them well enough, even with Rock music. maybe it does make sense after all, BWs do enjoy lots o watts.
I've heard the 402 driving some hungry speakers and it worked just fine... that was with the 2200 preamp? or the top SS Mac pre a couple years back now. 2100? MC21?
Good luck... some Mc owners will be along shortly.