As this thread has gone on (and on & on) more stuff has emerged....
next to no bubbles - that ain't right
juice has been mention but friend uses similar
But now it is 70/30 DIY and what strength is the citrus exotic fruit mix flavouring being added
(I don't know the concentrate but have seen it suggested mixed at quite low percentages)
I/We have mentioned the juice as a possibility
suggested wicking technique, change of cotton/juice
heck even vape pure 70/30 6mg base or something
(though personally I'd go to 60/40 max on mtl)
really need to ask you friend for some of his juice/cotton to try
or worse case scenario get him to wick it or borrow it for a day or so
Something(s) you are doing just is not working
and you need to go through a process of elimination to arrive at the main root cause
You wicked & wicked & wicked it - you need to look at trying different variables
(juice/cotton etc... as many have suggested)
than just keep running the same diagnostics over & over & over again