That s actually pretty good, the value command afr is always bugged with oft, i mean that has an offset so when you see command afr of 12, actually is around 11.84... your maf scaling is quite good, could be a little but better but i wouldnt flash the -2% lean tune
Keep this and if you want to make it leaner do it but make it leaner one-step in the primary open loop fueling from 5600 to redline
But you also need to fix the ignition timing B table and fix those flkc you are gettingq that are also drooping lightly the advance multiplier
Since you have those corrections, you won t get it faster than this.. and i wouldnt make it leaner with 91oct... i would make it richer actually
If you need help with this you can write me, for more power you need a better fuel