@ andria
It sounds like the burnt taste is due the atomizer, and it's a dry hit. If you get burnt taste lower the watts/Voltage. Your atomizers wick is not set up properly to use the wattage you want. In my experience kangers are set up for about 8w. Any more than that I had to make changes to ensure there was enough juice flow to the coil. I recommend figuring out if your wicked properly. Wick not too tight in the coil, slideable. Not too much over wick. When you get it just right you'll see bubbles rising into the tank about every 4 vapes. That's been my Experience.
But, I see a real rba in your future.
I think you're right; at one store today, talking with the guy about rebuilding, different tanks, etc, I said that I had thought maybe an RSST, since I like tanks better than dripping; he suggested that a kayfun would actually be a great deal better, so I might start looking around at those, just see what I can see. They do seem quite popular, for those of the coil building persuasion. I've never been opposed to the idea of building or rebuilding coils, just kind of afraid of it, it's so unfamilar to anything I've ever done before. I did finally get some better reading glasses, for up-close fine work, so at least I'll be able to see what I'm doing! I'm just getting tired of this constant expense to buy replacement coils.
I've been keeping it down to about 6.5-7 watts today. I'm thinking that the problem might be that many of these coils have been dry-burned a number of times, so even though the coil part still works just fine, the wicks are wearing out. So even if I don't really *need* to rebuild them because of the coils dying, I might do it just so I can a) get higher Ω, and b) get a new wick going on, in the coil itself. I do see those bubbles rising, and wondered if it was anything to worry about, but I guess not.
I didn't get to any coil stuff tonight, had to get my vape bag ready for tomorrow's trip to the folks' for our monthly housecleaning visit. I'm afraid to think of what my mom will say about this Sigelei. But considering how ignorant she is of this whole phenomenon, she may not even notice.

I'll be using the Hypertank tomorrow, for the long visit, and that's a brand new coil in the Hypertank, so I should be fine with that. I filled the tank and got the coil in, and letting it sit overnight to make sure there are no leakage issues, before I get 30 miles away from home! Of course I do plan to take along a T3S and one of the vv3's, just because it's 30 miles away from home, and feces does occur on a fairly regular basis.
Andria