I've done a lot with this personally. I like to raise the minimum airmass to mature inferred afr. It will still use the entire maf to infer, it just won't lock until time spent in the higher airmass areas is in a steady state.
I've also had the best luck by leaving LTFTs enabled and making use of endpoint locking.
Been through 2 years of hot rod drag weeks, switching fuels on both plus countless miles of driving and am always within 5% of actual alcohol content before an endpoint lock.