Lovely update. Love the individual cylinder firing. Shame early Spits have cylinder exhausts in pairs, I love to see them firing in proper firing order accompanied with the exhaust flames, faster and faster as RPM grow. Out of all all in-line engines, nothing beats the magnificent, almost perfectly balanced V12.
As for the flames, I too would like to see them more 'on the blue side'. However, as you have said it all depends on the fuel quality, which is nowhere near when compared with what we have nowadays. Definitely a mix of yellow/orange and blue burnout...