I know that the same candle with different fragrances in it can require different wick sizes up or down from the "naked" candle. Are there things you seasoned folks know about the fragrance formulations that help guide your decision when picking a wick to start with (such as vanillin content, flash point, type of fragrance like citrus vs floral, scent notes, etc.) or is the answer simply test, test, and test again? I guess what I'm asking is whether there is a knowledge base out there that will tell me things like (hypothetically) citrus scents will typically require larger wicks.
I know I'll need patience for all of this, but if I can save myself from unnecessary testing brought on by just winging it, I would love to!