You might have been seeing mine and/or MaxUT's posts. (Or maybe others as we are not the only ones.)
I'll explain it again. (I really need to do a blog as I seem to do this quite a bit.)
FA
tobacco flavors are different than any other flavoring that you will use. Each level will have a different taste. What you taste at 1% will probably not be what you taste at 4% and that could be completely different at 12%. So the previous two posters have found one taste for their flavorings and are sticking to it, but there are many more available with the same flavorings.
Since you have two sitting at 2 and 5, you will be able to taste this for yourself. The one at 2 may have slight hints of what you can taste at 5 while the one at 5 will be tough for you to say that it came from the same bottle, or visa versa. I did a post of Perque Black where I found that at one level it was a sweet flavor while it never seemed sweet above or below that.
These are also the only ones that I know of that with just one flavoring need some steep time to fully develop. You can taste them right after mixing and they may be good, but will have a completely different flavor when left for about 2 weeks. (They taste perfumey to me when fresh typically, but not always.)
And I'm also the one who has pointed out that too much flavoring leads to no taste. That is still true, but I have never gone too high on FA tobaccos. It may be that I bring them up very slowly to find a certain taste and then stop, but I have yet to go over 15% for an FA tobacco mix, so I may have never hit the "too much" point. (And I can think of one recipe that breaks this rule to work, but it has nothing to do with tobaccos so we can leave that one alone for now.)