I suggest taking a look at e liquid recipes dot com (ELR). There's a feature there where you enter all your flavors and it will make recommendations. Recipes are also rated and average flavor percentages are given.
I found that recipe where both were used (but completely different %)
https://..................../recipe/859335/Peanut Butter Tobacco
That's exactly where it came from but got dotted out. I've seen some recipes from there but I didn't know about the options you just mentioned, thanks, I'll explore that site a bit more