So today I ran through a few more tests with Rockstar, Monster and Redbull. All of them need to be mixed at or around 8-15% depending on how strong you prefer the flavor. I know that's a gap, but I prefer the strong end, others prefer the slightly weaker end (to me) to get them where they need to be

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All 3 of them are spot on in flavor. This coming from someone who used to drink all 3 daily (to the tune of 4-8 per day). Really all I can say is that if you're a fan of either or all of those drinks, then these are perfect for you. The only thing truly lacking is the carbonation and I've yet to be able to get that "feel" into a juice just yet. I don't have any of the Champagne flavoring, so I can't test what others on ECF have suggested, but if I can get a hold of some, then I'll be rocking it and testing it out.
I did get a chance to work a little with Rice Krispy, Double Dutch Chocolate and Captain Crunch and they're all pretty darn good. The two cereals do have a bit of an alcohol taste if you mix fresh and then vape, so I'd suggest letting them age cap off for 24-48 hours and keep shaking in-between to keep them mixed in the process. The DDC is pretty solid to me - it's a good chocolate vape and I'm not a big fan of any chocolate.
That said, I will be aging some of them over the next 1-2 weeks to see how well they continue to perform, though so far, I think I'll send in an order once I run out of things to play with. I have a few blends in mind as well, so that's what comes next once I sort through the other flavors I have on hand from other vendors.