Nice work on the article. The comment about the stove having no affect on the byproducts I disagree/agree with. On the one hand, the stove can affect the fuel/air mixture, rate, temperature that a fuel burns at, all of which will affect the resultant byproducts. Similar to how the oxygen fuel mixture in a car will affect the resultant byproducts in the exhaust. My conjecture is that the sooty mess that ISO-OH leaves behind means that there is a lot of carbon that is not being burned, thus not enough oxygen in the fuel mixture (and most likely, to low of a burn temp as well).
Having said that, I do not think that it is practically possible to make a simple alcohol stove that can get enough oxygen and heat to burn ISO-OH properly. So in the end, the stove type will not make a difference.