Try what you have right now, you may not need another amp.
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I ran into the same situation with phase problem on MC275 IV and V. I ended up with 2 MC275 V and "wow" what a different.
Yes, more power to better control of the sound. Music sound amazing without any tweaks.
I just purchased 2 new MC601 to compare and probably will not go back to any powerless amplification again.