SM owners, speed log question

minaxi53...
 

Does anyone have any advice for erratic speed log
readings on a sonic B&G. Also, is the 2 deg list to port
on my SM normal, I have noticed others but seem less
so. Majority of the heavy equipment is sited on the
port side, generator etc. is that why Amel moved the
battery bank to the starboard berth on the SM2000?

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