one shot you can get for R100-R150, then buy a big bottle to mix in, VG, PG and some Nic, barely takes up any space and you get 200-250ml of juice for cheap and then you have leftover bases for next mix!
why dont you just mix for DL and it will be way cheaper than buying store juice? the initial start up might be more but in the long run its WAY cheaper
I’ve never used a Kree Rta but I would guess that if you cover/close the airflow when refilling it will solve the problem. Sounds like a change in pressure issue.