Here’s what I would be interested in. If you’re using the Subtank mini, I know that build deck and you will have some very short leads on the coils. For Ti wire in TC mode, that is a major plus. It seems when you have longer legs on coils you tend to get hot spots. So, before throwing in the towel I want you to do this.
Rebuild your Subtank deck. Be 100% sure you don’t have any windings touching…completely spaced, and no part of the coil touching the base causing a short. Then wick it and wet the wick with juice. Don’t screw down the chamber. Do a test fire at 450F, 40 watts. Are you getting any hotspots? If so, stop there, it ain’t gonna work. If not, screw down the chamber and wet again. Test fire. Still no hot spots? If so and you weren’t before, you must have a short after putting on the chamber. On the subtank after putting the leads under the screws and tightening them down, you have to either wiggle the wire till it breaks or cut extremely close. The chamber is very, very close to the posts when screwed down and it only takes the most minute contact to throw TC off. If no, is it making vapor? If so, assemble and fill with juice. Fire. Is it working? If not, then perhaps the chimney is making contact with the top of the coil. You may have to push that coil down farther but not touching the deck. I’ve had this happen.
If you try this please let me know how it works out. I went through a lot of this type stuff when I was learning TC. If you already know all this and I’ve brought nothing new…then ignore me and go on Perhaps someone new to TC will read it and find it helpful.