You've never noticed the difference in smoke plumes in dry vs humid air? Hot vs. cold? Never seen the haze a temperature inversion can throw over a town? And while you say "amount of fuel" here, in posts 65 and 74 you dismiss questions directly about the amount of fuel. Do you know what % the cloud changes with changes in amount of fuel? How do you know that the planes are close enough to reasonably compare?
I am not an expert in this at all, but your question tells me that you are not either (or you'd have told me why you choose to ignore those variables). Unless you have good reason to ignore them, they remain simply sources of error, and they detract from your claims.