chrismeiring

The biggest retailers in flavors are Wizard labs, and Heartland vapes.
The reason I say they are the largest dealers is because they handle many different brands of flavors.
As to the particular flavor you want to mix, I have never tried that flavor, and wouldn't know which flavors are in it.

If you go with 20% flavor, the best ratio you'll get is 20/80 PG/VG in your mix, and that is assuming you'll be using any Nicotine (in VG base).  For your mix, I would start with a small batch (10ml) at 10% (1ml) flavor and 90% (9ml) VG (and whatever Nicotine if you are using it).  If the flavor isn't there for you, you can bump it up to 15% or 20%, but be aware  as you increase PG (flavor) you'll decrease your VG in the ratio.  Another solution to weak flavor would be to try a different brand of flavoring.  Some brands are more concentrated, some are sweeter, etc.... so you have to use a bit of trial and error to find what suits you best.
One thing I've also learned is what tastes great in one tank won't taste the same in others... so I do mix some flavors specifically for use in a certain tank, because I know the flavor will be optimized for the tank/coil combo I'm using.  So, what I'm saying is if it doesn't taste like you expect in your Arctic V12, you may try a different tank/coil combo and just "see" how you like or dislike it there?

What VG/PG ratio were you using when you bought your juice? Did you like that ratio? If so I would start there

What flavor is your concentrate and what flavor of juice do you want to wind up with (if it's a mix)?

How much flavor depends on the flavor, some flavors need a higher % of flavor, some need less.
My normal flavor percentage is 20%, but with a coffee flavor I only add 5%, and cinnamon I usually only add 3% at the most.
The PG/VG ratio depends on what you use it in, in my subtank minis I use 30PG/70VG in my dripper I use 20PG/80VG.