so decided to make a batch of 80/20 this weekend and see if i can replicate you loss of flavour problem.
made my base and then added my nic, the used 5% fudge brownie and 2% bavarian cream.
my second batch was with 5% watermelon
the initial batch with just shaking by hand was a bit bland.... but then agitated it and the GF suggested i use a baby bottle warmer.
kept it in the warmer for 30min at the lowest setting (lukewarm feeling) and then agitated, kept it again for 30min and tested. much stronger flavour and very thick clouds.
carried on doing this 3 times a day over the weekend and then on sunday i had it perfect
i think your problem apart from the agitating is the low flavour percentages. with the watermelon by sat i needed to add a few more drops to really get it to stand out.
maybe move up to 8% and try it out and see if that helps
made my base and then added my nic, the used 5% fudge brownie and 2% bavarian cream.
my second batch was with 5% watermelon
the initial batch with just shaking by hand was a bit bland.... but then agitated it and the GF suggested i use a baby bottle warmer.
kept it in the warmer for 30min at the lowest setting (lukewarm feeling) and then agitated, kept it again for 30min and tested. much stronger flavour and very thick clouds.
carried on doing this 3 times a day over the weekend and then on sunday i had it perfect
i think your problem apart from the agitating is the low flavour percentages. with the watermelon by sat i needed to add a few more drops to really get it to stand out.
maybe move up to 8% and try it out and see if that helps