@30 watts you are probably only vaping in power mode and the device is not regulating on temp. 30watts in power mode will probably give you the same nice vape. Problem is it is not regulating. Set the Preheat (which is not really a preheat in temp mode) to @100 for .01 or something. And you will see it doesn't regulate the temperature. It should start @100 for .01 sec than regulate down to the value to keep it a the set temperature.
New user here and I just got this Mod last week and TCR does not seem like it regulates at all and I agree, if you think you're TCR is working it might not be working see below.
Two things I've found regarding the TCR settings on the Sigelei 213:
(1) TCR settings: I will use Stainless 316 as an example. For Stainless (316) is listed on Steam-Engine at .00088 other sources have it 0.00092. Regardless of what you choose for your TCR, the important to thing to note is that on the 213 (at least for mine), it only has *four* places to the right of the decimal point and therefore there is not enough room to put 0.00092 or 0.00088. In other words you cannot enter .00092 or .00088; you can either enter "0.0008" or "0.0009. So if you're entering 0.0092 or 0.0088 you're entering a way too high TCR (higher than Ni200) for stainless.
I have tried both settings 0.0009 and 0.0092 and if I fire the mod at 0.0009 at 200F (preheat 27.5w, 0.25 seconds) I get nothing. If I enter 0.0092 and fire it at 200F (preheat 27.5 0.25 seconds) it fires as if I had the mod way cranked up. The user manual, I note, is totally silent on how to compensate for the lack of the fifth spot to the right of the decimal point.
(2) Second issue, probably worse than the above, is that TCR is totally unregulated. Even if I set my TCR properly at 0.0009 for Stainless, and then I up my preheat to 150W for 0.1 seconds and set my temp at 300F, I get a burned hit.
Btw, I'm using prebuilt 1.0 ohm SS316 coils for Joyetech Cubis tank, which works fine on the Cuboid (as you would expect given they're both made by the same company) with a resistance reading of 1.08 ohms.
Unfortunately I don't have a solution, but did want to chime in about the TCR probably not working quite right.