Help with Capella Dessert Flavors

[KingKut92]

Hey all, just purchased capella fudge brownie and peanut butter along with some sucralose. I'm wondering if any seasoned DIYers can give me a good idea of how to % these to make a sweet fudge brownie with a not overpowering peanut butter taste. Good to note I like to keep my flavor % between 15-18%

Thanks!