Hubba Bubba Strawberry is yummy good. One of my ADV's
10% Strawberry and 8% Bubblegum. Ive not used the sweetener in mine... ( but I will give it a try)
EDIT: I just checked, and I use regular Strawberry, not the ripe Strawberry.... so you may want to start the Strawberry at about 5% maybe and add a bit at a time until its where you want it.