Got datamaster scans need analysis

Anyway from what I see my left side BLM's run slightly leaner than the right side. Is this normal? I have totally replaced a fuel system components including th o2 sensors. Another interesting thing is the OEM chip does a better job at getting them to 128 than the upgrade chip. Overall it seems the oem keeps them slightly rich sometimes vs the upgrade leaning them out mabey too much.But the upgrade chip gets less knock retarding than the OEM. Is that significant?
I have 3 scans one upgrade drive,one upgrade static in the garage at different rpm's and one OEM drive. Any help would be appreciated as it looks like my upgrade will be going back with the scans to be better tuned.










