6% Jelly Candy Caps would be a bit too high to start off w/ consider using it around 2% and then use fuji around 1-2% depending how prominent you'd like the apple to be then build up the profile according to your taste. If you'd like it to be more sweet try a safer alternative sweetener like Stevia which should only contain stevia and be in pg no other flavor carriers one that comes to mind is Pyrue and whole foods 365 liquid stevia both are clean. Problem w/ sweeteners like fructose and sucralose is that they are based in actually sugar , sugar burns quicker and becomes carcinogenic their flash points are more than likely a lot lower than what you're vaping if you vape by temperature mode. So if you feel you need to add a sweetener then try to use a better choice and at this time it would be a stevia.
Here is a couple different options for that.
The suggested ratio for usage on Cap's Jelly candy http://e-liquid-recipes.com/flavor/71061