How to figure out ideal AFR's:
Lets make a hypothetical to work with, stock celled map in open loop / bike only running K&N air filter for mods. (this is your setup correct?)
1.) Now lets work with front cylinder first and shoot for a steady target 13.5-1 AFR in the open loop cells to begin with. Datalog 3rd gear pull on predetermined stretch of road (pick a landmark to start from and start there every time) now hold a steady WOT 2K to rev limit from that start point. Come back and edit cells off of that datalog and repeat the procedure until your datalog is rock steady to the 13.5 AFR for the front.
2.) Time to switch the wide band to the rear and do the same exact steps for a steady 13.5 AFR rear. All good now? Time to go to that same stretch of road you've been using so we can tune for ideal AFR.
3.) With that map hitting our predetermined target AFR of 13.5 front and rear, make 4 or 5 maps adding 1% to 2% more fuel than the last across open loop cells.
4.) Datalog 3rd gear pull on predetermined stretch of road (pick a landmark to start from and start there every time) now hold a steady WOT 2K to rev limit from that start point. do it 5 times same exact pull and same landmark. Overlay data and pull the average
5.) Do the same procedure as step 4 with each map created in step 3.
6.) Overlay averages with time from 2K to rev limit, shortest time it takes wins.
At this point is where I'd call it good but keep in mind you "could" make more power with a different AFR from front to rear. Lets say your richest map has a value of 12.8 AFR and your shortest time on data overlay (step 6) was a 13.1 AFR. You would do steps 3 - 6 again only pulling or adding fuel one cylinder at a time. This would be like splitting hairs on a 90hp engine and VERY time consuming, not worth it IMO
This also doesn't take into account timing adjustments.