Normally you want your Left and Right mains to be matched to the center.

If you do a search for "subject" only for +martin +logan for the last few years there has been much discussion. I recall one guy saying his M60's were staying and he was returning the MLs, not sure what models though.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85