For AFR there is an offset you can adjust. Power up SDS, press right arrow 5 times, find the window showing "SETUP MODE ENTRY"
Press +1, the scroll right arrow until you see "SETUP AFR OFFSET" It would be zero now, but if SDS is reading a bit lean, you will need to bring the offset into the 245 to 255 zone (use minus 1 key to go below zero), (this is negative actually deep in software) This will reduce the displayed AFR reading in SDS. An adjustment of 22 moves the AFR by 1.0, so adjusting by 2 gives about 0.1 change.
Be sure not to change any other values in Setup Mode. There are many bytes here that can critically affect how the ECU does certain functions.