MKA is a difficult game to play as a backup either from disc or on the USB HDD. For disc backup, I have seen people use ISOPatch to patch the game to IOS249 to get it to work, but still reported problems with the Wiimote controls being sluggish or difficult. I think that is what you are seeing. Do a search for the game on this site to see what newer fixes, if any, have been reported for this game played from a backup disc. Good Luck.