are you changing your maf during stoich operation? because that should be done with fuel trims if you arent forcing open loop. and if you are gonna force open loop and go that route, you need to shut off dfco.
set ramp in much lower than 2.0 during tuning as well. im assuming your wideband at the end of your downpipe. because there is a lag time in the readings. look at the supplied pictures of your logs. goes from a commanded 14.7 to 11.6 immediately. the wideband cant keep up and it shows a lean condition of 30+ afr error. if your wideband is far downstream, its not receiving the pe burnt fuel and air yet. setting the ramp in lower will help this. does that make sense? im in class trying to focus on this as well. i apologize if it doesnt lol
afr lean1.png
afr lean2.png