Wide band is cool I wish I had one of those when I was setting up my Weber on my old Sammy. I did use a data logger on the O2 sensor and tried various jetting / emulsion tube combinations until I got my "Driving profile" to be averaged out to nominal. You could watch the O2 sensor output move back and forth as the computer adjusted the mixture.
Oh, I probably should mention that I took the top off a Holley/Weber 5200 off my Dodge Omni and put it on the top of my Weber so the O2 feedback actually worked.
Anyway the data logger recorded the the O2 output and I shoved all the data into Excel and computed the average voltage reading for my "Trip". pretty soon I adjusted the jetting for I averaged 0.5 volts. It took a couple of days of trying something and then testing. You can't change one thing and see immediate effects when fine tuning.
Raw Data from O2 Sensor
Average of readings calculated by adding up all data points and finding the average.
I'll have to see if I saved any of that data. It's on a 5-1/4" floppy someplace...
Anyway some DMM like a Fluke 87 can do averaging automatically for you wich would be great to see your average settings.