I personally like the combo of American Red Tobacco + DV menthol for a menthol tobacco. Personally I don't mind the touch of sweetness that VG brings to the table, but if your trying to avoid it, I would drop the VG from your mix altogether, as that is where your sweetness is more than likely coming from.
Typically I go about 20% menthol to tobacco. (Aka 2 drops menthol to 10 American Red Tobacco), and i find that mix works well for me.
More detail, I have a premix of American Red Tobacco 36 MG, and a PI-PG. I'll mix up a 36 MG menthol (15%~ concentrate mix.....I like it a little strong, I also use my AG dilutent, but you could sub with PG to remove sweetness). Once I have it mixed, I'll take 10 drops of American Red Tobacco to 2 drops menthol ratio, and mix those together, and thats my mix for it. I don't have any experience with PEG-400 yet, so not too sure what that is bring to the table in terms of sweetness, but from what I've read it shouldn't be much.
Now if I were working with the American Red Tobacco concentrate, I would also stick to pg to limit sweetness, and still use the method above.
If you try it out, let me know how it works out.