Super concentrates are tricky. I mix those flavors by themselves until I figure out the strengths. I haven't found a chart or list of suggested percentages for these super concentrates, other than the 2.5% recommendation across the board for all of them. It's pretty accurate though, varying by +/- 0.5% (IMO). I've been using 3% for almost all of them, although I'm not into mild base flavors. Since I make batches of single flavors, mixing them together is like mixing drinks: 3 parts Island Tobacco, 1 part Pineapple, 1 part Coconut... 3 parts French pipe, 1 part Chocolate, 1 part Coffee... etc. You probably know way more about this than I do, but I would definitely suggest making separate flavor batches initially when using SC's.