Sheb,welcome. There's no good reason to expect "more soundstage" from the M60. The same mid-range and tweeters are used and the dispersion in the directional mid and upper frequencies would be essentially identical. For a somewhat wider soundstage you should separate the speakers wider, to at least the 8' you mention as being possible.
As to the sub/M22 crossover, if you have a "great" sub there should certainly be no "jump" with an 80Hz crossover. There's none with my M22s and EP500; the crossover is entirely smooth. The M22s are strong to below 80Hz and any decent sub would be good to above 80Hz.
So, there doesn't appear to be anything supporting the M60s as an actual "upgrade" from what you've described.
