So, I know there's been a lot of posts about problems with temp control on Joyetech products, but I've yet to find anyone having the exact same issue as me. I just picked up a Cuboid/Cubis combo and I've been playing around with it for the last few days and I have a few problems. I'm using the .5ohm ss316 coil heads. At first I used them in regular power mode. I noticed that they couldn't really keep up when chain vaping. I figured it's not wicking well enough for my 70/30 juice blend. They are some pretty small juice ports, after all. So i figured it's time to dive into TC on the Cuboid. So, I put the cuboid in temp ss316 mode, and then put a brand new cold coil into the tank. Resistance is reading at .5ohms, just as the package said the coil is. BUT! I'm noticing that just tapping the fire button one time, the temperature shows up on the screen as 185F, and it's a COLD coil. I set my temp to 450F, and 50 watts. It immediately hits protection, and I get hardly any vapor output. So I crank my temp to 500, and still having weak, unsatisfying vapor. Crank it up to 550, and it gets a little better, but still hitting protection and not really producing. Even with it maxed out at 600, I still get very cool vapor, and not much in the way of clouds. I've tried it with the resistance locked, and unlocked, no luck. I tried resetting the resistance by unscrewing the tank and hitting the fire button without an atty, no luck. After sitting on my desk for hours, and then tapping the fire button once (not holding) and the temp still shows up in the high 100F range. Sometimes it even shows over 200F, on a COLD device. I then tried using the Ni200 coils in nickel mode (bringing up another issue, my nickel coils taste like motor oil), and I have the same problem. It is reading that resistance at .21 (should be .2, so I guess within tolerances), but even on a COLD coil, tapping the fire button reveals a temp of 193F. Same issues as with stainless, hardly any vapor production and cold vapor at that. I'm using v3.10 firmware, but have tried 3.11, 3.01 and same issues with all. I finally tried using a custom TCR value. I came across another post recomending TCR of 130, and that actually seemed to get it close, but Steam Engine is saying 316 should be a TCR of 87. Right now I'm having to use custom TCR of 130, temp is 530F, at 50 watts, and it seems like it is actually getting in that temp range, but I also noticed that in TCR mode, tapping the fire button on the cold device shows a temp of 70F, which is right on the money, the AC is set right at 70 here. I don't know why it seems to be reading the correct base resistance, but for some reason attributes that to a high temperature in either ss316 or nickel mode. Also worth mentioning, I have never seen the New Coil screen come up, even when unscrewing the tank and hitting the fire button, then rescrewing. I have a vtc mini as well, and it seems to have similar issues, but I haven't really tested on that device, since I usually just use that with my kanthal coiled subtank mini.