Thanks for the replies! I did a few more builds since my last post, noting the items that you mentioned and on the last one, at first, the button was getting a little hot but now it seems to be OK.
For all of the builds up until the last, I just had the silica holding the negative wire down. On this build that I just did and took pictures of, I have it trapped between the knurled ring and the base. Is the first picture attached to this post what you were looking for as far as the channels go? As far as the coil itself, I do try and recess the coil a bit to eliminate the possibility of it touching the mouthpiece when I screw it on but there is definitely plenty of space between it and the nut at the bottom of the ceramic. Also, with the positive lead, I screw the nut down on it to make a connection and then make circles with the wire, like in igetcha69's videos, to break it off. Made sure there was nothing sticking out with the last build though.
Never used the continuity beep setting but it was easy enough to find based on your description! Great tip. This helped eliminate a possibility I had been considering for a while, that something, maybe the post against the housing, was shorted with the rebuildable part itself but there was no beep when testing it with nothing installed. I did also follow your steps and, at first, got some heat when I put the mouthpiece on. Took it apart, took the pictures, put it back together again, and now there seems to be no heat; I got it fully assembled and will vape it for a while and keep an eye on the switch. The thing is though, it literally looks the same to me as before. One thing I keep thinking of is that when I'm screwing in the rebuildable part is that it's moving the positive wire but I kind of can't see why this would happen. I never force the part when screwing it down and have played with screwing it down harder sometimes and softer other times with no real difference in results.
It does seem to be something with the base and/or the mouthpiece though; any tips on avoiding this? It seems obvious enough to just keep the positive wire as flush as possible in the channel and I do this though. Basically, I seat the coil, gently pull the wire down into the channel, and use the blunt tip of a syringe to create a 90 degree bend in the wire so that, in the channel, it is flush with both the side and top of the ceramic; then I wrap at around the post, pull it snug, and tighten the nut.
View attachment 275759View attachment 275760View attachment 275761View attachment 275762
Thanks again; I think we've made some progress but time will tell. In the mean time, hopefully everything looks as good to you all as it does to me in the picture! Please note that in the second picture, no coils are touching; it kind of looks like it a little because of some glare.