Maybe lower nic level to 3 and 100% vg?
Sent from my SM-G928W8 using Tapatalk
I'd try this suggestion first, this tank goes through more juice then your old set-up so you could be getting up to the double amount of nicotine per inhale. I recently got my first mod & tank too after 5 (!) years on an Ego and went from 6mg to 2mg myself and don't feel I'm getting any less nicotine. I must admit I have starting vaping more too though, simply because I'm enjoying the new set-up so much.
For starters I'd turn down the airflow as much as possible. If you use the SS316 coil that came with it try temperature control mode, set it to 30W or so and start at a low temperature like 180c or 360F and work your way up to find your sweet spot.
You might just start to find that tank very enjoyable
Good luck!