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I've had 10* in BOTH directions unexpectedly/unintentionally. Source was things like altitude compensation bias, EGR bias, main bias. I'm certain it was merely an XDF issue or something when I saved one or more tables. I worked around it by setting most/all bias's to 0 (negative advance with EGR on or high altitude compensation would be pointless, right?)
CPI bins have no main spark bias. I found in code once where spark is added up the last thing done was SUB spark bias, this was a major concern with change to CPI/MPFI code, is the main spark bias still Subed out?