Not knowing what brand of flavorings you used.....I would just venture to say possibly too much flavoring? ie...too high a percentage...looks like you are at a total of 24%?
This is what I do...it comes from the old 306 dipping days a few years ago...
I have 2 contact lens carry cases...great for quick mix sampling.
What I call cutter is just no nic base....ie...if I am making a 50/50 nic'd
juice....I will have a 50/50 bottle of no nic pg/vg.
In 1st carry case ---
In 1 lens bowl....put 2 drops of mix and 2 drops of cutter - makes
juice 50% weaker (for you...12% total flavor)
In other lens bowl...put 3 drops
juice and 1 drop cutter - makes juice 25% weaker (for you...18% total flavor)
In 2nd carry case ---
In 1 lens bowl...put 2 drops juice and 1 drop cutter - makes juices 33% weaker.... (for you...16% total flavor)
In other lens bowl....you can decide how to adjust cutting...for more or less strength
Test taste from the most cut one first and move up to least cut and then you will have a better idea where to go.
Doing it this way...you are not having to try and make new percentage mixes in different bottles....just figuring how to correct only one bottle
Hope this helped a lil bit.....