The Subvod mega TC is a temperature control device.
Read your instructions carefully.
Be sure you know exactly what type of coil you are using.
The 0.15 ohm coil was likely a nickle (NI200) coil. If your battery was set to wattage (non TC) mode it would give you the type of vape you experienced.
I believe it is a one button device so changing the settings will flash different colour lights.
TC may only be adjustable to Low, Medium, or High. If it was set to the high setting it may also be too hot for you.
If you do not understand the instruction manual type the device name into utube and watch some vids on it. hth. Cheers.
Edit.... Found this....
Battery Function
1. Speedy 5 click the button to switch on/off the battery;
2. Once the battery is on, press the fire button 3 times to select the operation mode:
A. Power mode: once press the button, it display RED
B. TC mode: once press the button, it display GREEN
3. TC mode setting
A. Set the SUBVOD Mega in step 2B above.
B. Remove the tank and press the button, LED will flash Green in 3 times.
C. Screw the tank on and press the button, this time the button will flash Green 1 time.
D. Make sure the tank coil at room temperature, or else the TC may function abnormal, which will cause burn taste.
4. When atomizer resistance is less than 0.1ohm or no coil installed, press the button, it will not function and button will flash 3 times.
5. When the battery drain out, press the button, it will flash 3 times and user needs to charge it;
6. When you press the button over 10s, the over use protective will activate;
7. When charging the battery, the bottom LED will turn red. It will green once fully charge up