I've made some progress, and found a few flavors I can live with while I experiment more.
The TFA Black Honey Tobacco at 5% isn't bad, after sitting a couple of days. Flavor is a little weak for me, but I'm going to let it sit a few more days before upping the percentage. I also mixed up some with 5% BHT and 2.5% apple - it still needs something, but I'll let it steep a few days before messing with it.
TFA Flue Cured Tobacco at 5% actually tastes pretty good to me. Maybe need to add another percent or two, but again, I'll let it steep a few more days before doing that.
Using the recipe in the eJuice Me Up calculator, I mixed up some Bahama Mama. I used the TFA Coconut Extra, and it had too much Coconut, so I added another percent of the orange, pineapple, and mango. That helped, but I think I still need to lower the Coconut Extra for the next batch. Anybody know how much stronger TFA Coconut Extra is than regular Coconut?
I also made some Black Cherrybacco, using the recipe in the calculator. It's not bad, either, after sitting a couple of days.
The RWhy4 has been steeping for about a week and tastes
really good. I need to mix up a bigger batch of that. It may be too sweet for an all day vape, but I'll definitely be using more of it.
I also tried the Cowboy Blends mixes I made at 1,3,5,7,and 9 percent. They need to sit longer, but the 5%, which has been steeping the longest, is starting to lose some of the flowery/sweet/chemical flavor. Still not much like tobacco, though. I'm thinking it may be possible to mix in some Tobacco Absolute or something and save it.
Also, since my main vape right now is the Vaping Zone's Honey Flue Cured Tobacco, I ordered some of their Super Concentrated Honey Flue Cured flavoring so i should be able to replicate it. Just have to find the right percentage. The description on their site recommends starting at 2.5%, but I usually get an extra shot of flavor, so I guess I'll start at 3% and go from there.
I've went flavor crazy.

I just got some Commercial Cigarette and Honey Flavor from Seedman in the mail today. I've got about 40 flavors here now, and I'm out of little bottles. Seems like there's never enough little bottles. (More have been ordered, though.) I'm afraid to throw anything out, thinking the bad ones may get better with time. And I don't know when I'll ever have the time to try all of these.