Ok, so that 1.02 log is what I used to create the current MAF scale you have now, so it should settle right on top of commanded AFR upwards of 3800.
My car adds about -3 FLKC in areas with petrol on track compared to on the street, without any IAM drop. You would need to pull about 2 degrees out of base timing to make it "knock free" on track, which is de-tuning the car tremendously. That's why I say don't bother. Note that only applies over 5k, if you get -3 FLKC below 5k it will drop the IAM like a rock!
If you run the regular 98 map it may still pull some timing at track temps with your fuel, but will not drop IAM. At the end of the day you can run more and let the ECU pull, or run less and have less power on the street. Either way you'll end up with around the same lap times. Again, ANY timing you add will get pulled at the track at high temps.
The only thing you might want to do is add more timing below 4000 for the street. But if you don't drive it on the street like you say, then that might be a waste of time too.
Petrol on track:
http://datazap.me/u/wayne/stg2-ace-9...om=12687-13952
Compared to only pulling about -1 FLKC for E85 due to fuel knock resistance:
http://datazap.me/u/wayne/stg2-ace-e...om=12956-14001