Hi, kbozarth,
I have experience with BB's Energy and White Tea & Ginger (they're two of my favorites!). I have never noticed any discoloration issues with either of them. I don't use a vanilla color stabilizer with either one.
Never used the Black Cherry, so I don't know about that one. I checked BB's description, though, and they don't mention anything about discoloration. They're good about noting things like that in the description.
If your clear layer is yellowing, you could try "bluing" it -- just add a tiny bit of blue (like a drop or two, depending on how much base you're using) to make it more blue-based clear than yellow-clear.
Hope that helps!