Yup gotta jet down that beast, don't want to wear out your rings from fuel wash. Even 14:1 at cruise is wayy better for engine wear.
Took the car on a proper drive tonight so the carb got fully warmed up (air gap manifold takes a while). Mixture was around 16:1 at cruise and 13:1 at power still; it drove great no real difference in driveability unless it's not fully warmed up.
Gave me an idea of what to aim for on the demon, 12.8-13 at WOT and whatever the cruise ends up at as long as it's above 14.
This is amazing it would have taken ages to figure this out without knowing the AFR directly and what the engine likes at different ratios.