This is a good catch! As you said in the (BRACKETS) just because the numbers are 10% apart doesn't mean the correction is a 10% change... It's most likely more (especially going from lower pressure to higher pressure) I'd be willing to bet that your ECU has a faulty baro sensor. 1030 mbar to 930 mbar would represent a little more than 2000 foot elevation difference. It would be interesting to see if the baro error is linear, cause if it is then a correction across the whole map should be good. If the error isn't linear, you could have problems down the road with elevation/pressure changes.
I'm really looking forward to getting a GET from the TacoMoto guy for my 2020 500 here pretty soon!