Originally Posted by tgmillso
The difference between the full rich EGT and the peak EGT for cylinders 1, 2, 3 and 4 were 180, 180, 195 and 180degF respectively.
The relationship between delivered mixture and delta-to-peak is entirely reliable. You're right around 0.085 F/A, or 11.75 to 1 air-fuel, richer than max power. You can plot it yourself on the charts posted previously:
Or there are charts like this one, an oldie from Lycoming:
Spend your effort working on baffling and sealing.