I thought about that too, the sugars in tobacco possibly reacting quite different to our coils than sweetners in off the shelf flavorings. But... I still speculate that non-sugary particulates are by far the main offender of our gunked coils.
Maybe others have noticed that sweeter tobaccos gunk quicker than drier ones, but I haven't on any difinitive level. Some of the driest vapes have been the gunkiest (as in W2V's London, Paris, Louisville, etc.). Another example being how MOV's Apache gunks quicker than the much sweeter Hey Jack. Also, the home brews I've received seem to gunk the same depending on the extracter and not the sweetness of the NET.
I'm also just speculating based on limited knowledge of the area and my own personal experience with my own personal equipment and vaping style. The sugars in the tobaccos could very well have a bigger impact on coils than I'm theorizing. As Billy Joel says, you may be wrong for all I know but you may be right.
Jerms,
My experience parallels yours, with the possible exception that I'm even less certain of the validity of my conclusions than you seem to be.
When I read Johni's post---I can't remember what thread he posted it in, one of the home extractor threads probably---it was literally the first time I'd been exposed to the idea that sugars might cause gunking. Now, I trust that Johni has his head screwed on straight, so I took in what he wrote in one bite, and with less than my usual skepticism. What you and I have been tossing around in this exchange is a sort of backtracking to run the presumption through various reality checks, with the caveat that both of us acknowledge uncertainty about what's "real."
At this point, I'm inclined to go with your point of view. If sugars do cause gunking and carbon build-up, I'm guessing that they contribute to those effects in only a very minor way. Particulates and other organic compounds that leech into the maceration solvent from the tobacco still seem to me the most likely suspect on which to pin the crime.
In that vein, I just re-coiled/wicked the heads of five Evod-style clearos that I've been using on Vision Spinner clones and iTaste V3 batteries for my best homemade cigar NETs. I didn't bother dry-burning the coils, since they were all heavily crusted, and anyway I had 50 pre-made coil/wick assemblies (NR-R-NR 32ga wire, 1.5 ohms) from Fasttech all ready to go. Rebuilding the Evod heads by swapping out the coils and flavor wicks was almost as fast as dry-burning, with much better results. The restoration of flavor and uptick in vapor production were instantaneous and quite dramatic. The old coils and flavor wicks lasted for about a month of moderate daily vaping (maybe 10 minutes per day on average), but probably should have been changed a week or two ago.
Thing is, my cigar extracts are really fairly clean performers, relatively speaking. Just goes to show that macerated NETs require at least periodic and often frequent coil/wick maintenance. But so what? Changing coils and wicks is a small price to pay for the delicious experience that good macerated NETs offer.