So I hadn't changed the tune at all after it was dialed in at 12.0 AFR at full throttle. Yet yesterday as I was WOT in 2nd at 5k RPM it started creeping from 12.0 to 14.0+(I didn't keep going to see how high it wanted to go). I pulled out the laptop and changed the values from 4.5k rpm - 5.5k rpm at 10 psi - 11psi. They were previously at 9.7s, but now no matter what value I use(10.7 made no difference) it keeps creeping lean. Any ideas why it might be doing this is much appreciated. Thanks guys