Greg
I don't find autoignition temperature neither in your first msds (I suppose you are using) nor in my last one, (aviation test fuel) but both flash points are almost identical.When you find a consistently higher autoignition temperature you are in presence of one or both these components -aromatics or very low C as exhane_
As for your test it appears interesting the "dry" output. This should mean a good evaporation and corresponingly low diluition of lube.
Also I think a good idea adding some ether for mixing components, maybe also a bit of isopropylic alcool (cheap grade?) could help.
I am not advocating a "straight" mix made only from lighter. A mix is a compromise, so some Kerosene could help balancing. I am testing by gradually substituting kero in two stroke mix.
An idea, if one finds the way to pass the exhaust gases in water, liquids will collect on the top, and a better analysis could be easily made
ugo