Well... I did a bunch of searches. Guess what kept coming up? You. No offense, but you have got many suggestions from many people. Could it just be you need to let the juices steep longer (DIY and pre-made)? Some of the recipes mention "oak" flavor... would you describe the flavor as "woody"? I am trying to help (still working on my own
tobacco mix) How about "nutty" If so, you must try Purilum Sweet
tobacco. RY4s can be very different... some are caramel/vanilla and others (to me) just taste like butterscotch (TFA) There is also "smokey" flavors, "dark" flavors (like pipe tobacco) and "spicy" (oriental) Have you simply considered creating something new instead of chasing the Marl bo ro rabbit down a hole? If you go DIY, mix very small batches of EACH flavor before mixing a complete recipe (any cheap
rda will work for taste testing, just re-wick between flavors... and dry burn coil)