What company makes the RY4 Double and RY4 Asian Flavor?

Mixed these two together a month ago now both at 15% and been vaping it ever since, Love it.
I mixed a batch of this a couple days ago, however, I added 1 drop of tabacco absolute 50/50 mix.
It's pretty tasty, and I didn't like the Asian ry4 on its own.
DjXy - you added 1 drop TA to the batch. What size batch did you use? I'm struggling to figure out where to start with tobacco flavors/bases.
I just mixed per recipe how long does it need to steep?
Does anyone know what the difference is between the RY4 Double and the RY4 Asian
The DRY4 is reasonably balanced,slightly vanilla forward on my palate.
The Asian RY4 is very caramel forward on my palate.
I go through 30ml or so a week of the DRY4 and aim to steep for at least a month.
The one time I mixed some ARY4 it ended up closer to 2 months before I thought it was ok.
Of course,taste is subjective and YMMV.