Since high output MC cartridges are designed to be used into MM phono inputs, it's their output level as well as loading that are properly matched when connected accordingly. If you connect it to the MC input the signal will be given more gain than is necessary so the signal could become overdriven and distorted. The loading is generally different as well so the cartridge may be operating into a less than optimal load which can further affect its output from the ideal. Most listeners will prefer a louder level when compared to lower, so I have to wonder if that's why you found it notably better sounding when connected to the MC input due to its additional gain. To be fair you should compare them at the same volume level, even though you'll have to turn the volume control to a much higher setting when feeding the MM input to match volume of the MC input. Be careful if you continue to listen to the cartridge into the MC input to be sure that you're not getting any distortion artifacts. You're definitely safer running it as recommended into the MM input.
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