Hey supersheepo.
Did you use a crock pot or normal pot on stove? When I have used the Marsofold tek in the past, I do 4 boils in total (no crock pot), let it all sit overnight to let bark matter settle and then boil everything down to a reasonable amount. I have never needed to use anything as large as a gallon jug to pull from. I've used a 1 liter bottle with great results after an extraction using the same amount of bark you have.
Were you attempting to do your pulls from a pot instead of the bottles? The layer may just be too thin to pull. Try pouring everything into a glass bottle with a thin neck, which makes it so much easier to pull the solvent off the top and see what your working with.
"Distallates (petroleum)" is another name for naphtha, as is "light distillate hydrotreating process", which is telling you it is "light" naphtha instead of heavy (a good thing). Try pull up the MSDS/safety sheet to see exactly what it contains.