Originally Posted by Jhill

You got it backwards, your B2 ideally should be more like your B1. Your B1 is doing zero corrective action so it’s mapping based off the MAF and then feedback from the AFR sensor is perfect. Your B2 is either under reporting air from MAF, slight vacuum leak, exhaust leak before AFR etc making it have to correct and add fuel. Although 3% isn’t a huge variation.

As to it being related to your misfire, I doubt it.