Try reducing the total flavor percentages. Some people(myself included) prefer lower quantities of concentrates. There are 2 ways of doing this...
1: The easy way, enter your recipe at lets say 20ml, then if you want to reduce your percentages to go with a 15% rather than a 20% total, add 10ml extra of your preferred base(nic included)
2: The also easy way, lets say your total percentage is 20% and you want 15%,then 15/20 = .75 Multiply each percentage by .75....For example:
Strawberry 10% (x 0.75 = 7.5%)
Blueberry 9% (x 0.75 = 6.75%)
etc.....
Then enter your new percentages in your calculator.
I find that higher levels of concentrates tend to dry out my tongue, but some people have that same issue with PG and some with VG...keep toying around with it and you will find the trigger for you and you will have an idea of what to do!