Well, my story is a bit different,,,, maybe the coil may get some gunk on it but this doesn't stop my 357 Atty's from working just fine and I'm still getting great flavor too. I have about 10 mods set up each with a 357 on them 2 Reo Grands, 1 Reo Mini, 1- Reo Woodvile, 1- VV Reo Woodvile, 2 Darwins, 2 Provaris, and my new VVPV, 5 of these mods are now running 5 Months with a 357 on them, all taste super and are still working exceptional. So even if there is a little gunk on the coil of the Atty after I have cleaned it the heat from the coil also has to help burn some off too, now I'm not saying any gunk cant be left because I'm positive there is but all 5 of these 357's are still running super and putting out a great vape. NO Atty will taste like it did as the initial break in I think after 5 days, but all in all I think these 357's are the best of the best on the market and those 5 that are still going for 5 months now still taste great and provide me a super vape. By the way I use Boba's, the Raf, and some other dark juices and I use all VG too, in my honest opinion keeping them wet always is what makes them last.
While mine still vape and taste better than most attys once gunked, the air flow tightens up and the amount of actual vapor gets frustratingly low, no matter how long I hit the trigger. Amazing really how the flavor stays no matter what. I've never had one pop due to gunk build up, I just get annoyed by the deterioration of the vapor production and break them trying to fix them. Maybe because you have so many mods going you aren't abusing them the same as someone like me with only two going at a time, one of which I am using 80% of the time. With 10 I'd get totally confused, I guess I am a simple style vaper. I can use the same juice exclusively 6 ml at a time. If I can't I don't buy the juice again.