My boys are huge fans of the mix I do with TFA strawberry ripe.
50/50 pg/vg 18 ml nic
TFA Strawberry ripe 15% (tried it at 12% first time and it was a bit to low with the 50/50)
TFA Cherry blossom 2%
koolada 1%
about 1.5% lemon
juice
edit to add that the boys rave about this one so much I bought a 30ml bottle of the strawberry ripe.