Just use VG nic for your ratios to be right. Yes bit more shaking involved but I found the vg nic to have an better effect.
As soon as I dropped my flavour % I got better juices. I never add more than 3% of a specific flavour. Total flavour % almost always under 5%
And yes skip the one flavour mixes, dont know any of yoyr concentrates, but Ill take a stab.
3% berries, 1% passion fruit, 0.2 pacific cooler, 0.3 koolada
And that Amarula just sound if it will work with the salted caramel. Maybe 3% amarula 0.5 salted caramel and maybe some wishky flavour with it.
As soon as I dropped my flavour % I got better juices. I never add more than 3% of a specific flavour. Total flavour % almost always under 5%
And yes skip the one flavour mixes, dont know any of yoyr concentrates, but Ill take a stab.
3% berries, 1% passion fruit, 0.2 pacific cooler, 0.3 koolada
And that Amarula just sound if it will work with the salted caramel. Maybe 3% amarula 0.5 salted caramel and maybe some wishky flavour with it.
this turns out to not be bad at all
in fact it's quite yummy
will report back after some steep 

Just does not seem to work out for me 
I liked the NCV burst original, wife said it smells like Nachtmusik chocolate and tasted like chocolate to me but when i want to order the only original is peaches and cream
. Are there different original burst flavors?