When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hard to tell a lot from that limited data grab, but the 16~18:1 at that moment is normal. From what I can tell you were decelerating then hammered the gas, at that moment you will have funky readings. I think you are running lean tho, they should have corrected by 4300. You want to be right around 13:1, and B2 seems to be running leaner than B1. I would personally like to see less variance between them.