I was thinking about this after I crashed into bed last night. First, the calculator does take into account the nic in the WTA. You can't have WTA without nic. The combined WTA nic and regular nic are 42.5ml nic base. To get a 24ml mix with the WTA you would have to use 9.6ml of the WTA or 4ml of the 60ml.
I smoked 2 packs a day myself and was at 24ml nic when I started. I had to start using some 18ml in there right away and still use both levels through out the day. In general I end up getting about .5 to .75ml of WTA a day. I blend about 6 drops into about 1ml a minty menthol mix that I keep all the time and swap over to about 4 times a day. If I feel I need it (craving or starting to feel out of the loop) I put about 4 drops in my RBA and that generally gets me over the hump.
Ok so lets go back to never done this before. Are you creating the mix or did you find a recipe that calls for such high amounts of flavoring? I do high VG mixes and don't often have to go anywhere near that high to get good flavor. What is your goal flavor and what flavorings (and company if you know) are you using. One reason to keep the volume of flavorings lower is it is just easier on your equipment and the other is it is easier on your your wallet long run.
Okay, I didn't think about the fact that WTA is still nicotine and therefore would have 95% regular nic and %5 of the WTA - d'oh!
I am fairly new to vaping, started in March. I started with 12mg then quickly realized that wasn't strong enough. Moved up to 24mg, but still had analog cravings, so I tried 36mg and had headaches, nausea, and dizziness, so I went back down to 24mg. Now, I'm at 24mg or 18mg using the WTA throughout the day. I don't mix it in any other juices yet. I find that dripping the WTA helps a lot. I hope I can get to 4X a day like you are doing with it.
I am not following a specific recipe, though having one would certainly help. I have purchased from High Desert Vapes:
Ella's Blueberry and Pomegranate with Stevia (10ml)
I have in my HDV cart now:
Ella's Raspberry (10ml)
TPA's Peach (Juicy)(10ml)
TPA's Koolada (3ml)
Sweetener (generic sucarlose) (10ml)
FW Black Tea (3ml)
FW Blood Orange (10ml)
Ella's Cranberry (10ml)
I would like to use just the blueberry/pom in stevia for one bottle, maybe with a few drops of Koolada. Then, use the peach/raspberry/sweetener/koolada together. Then use the black tea/blood orange/cranberry together. I read on other DIY threads that Capella's flavorings are forgiving, flexible, but more expensive and require higher concentrations (10%-20%) than other brands. So, that is where I am getting higher concentrations from, but I know some of these are not Capella's.
I have both VG and PG in my HDV cart, 120 mls of each. Really, I could do any vg/pg combination. And I have 3ml, 5ml, and 10 ml bottles to try stuff out before I add the nicotine.
I downloaded that ejuicemeup calculator, so that should help down the road when I get a better understanding of this.