As with any new Atty, have you cleaned it properly? Machine oil residue can cause a nasty taste. Personally, I don't use stock coils, but rather build my own coils, due to not knowing, what the coils material actually is made of.
A higher gauge (thinner) wire can help with that problem. So, when you use a 24g wire, use a 26g wire instead, adjusting the wraps accordingly.
I always have to think of an eJuice I used to buy (Vanilla Dream). It couldn't be vaped over 25W, due to tasting burned/toasted above. Obviously, that eJuice didn't work in sub ohm tanks. Therefore, I would try a different eJuice in the Billow V3. Ideally a juice that's clearer and less sweet.
Good to hear! I'm still waiting on my two Billow V3, that I ordered. Can't wait for them to arrive.
I have a Billow V2 and I like it a lot.
The sizzle is normal. It has to do with the heat capacity of your coil, e. g. a 22g coil, or Clapton coil will take longer to heat up, and cool down as well. If you want to stop the sizzling, you'd have to put a different build in your Billow, utilizing a coil build that has a lower heat capacity.
First, you can't compare the Billow V2 to the Billow V3. It's like comparing Apples to Oranges. The Billow V3 obviously differs, otherwise it wouldn't be a V3. It is possible that the heat of the coil isn't "absorbed" by the atomizer as good.
Definitely try a 3 mm ID then, it will prevent the wicking issue, thus dry hits, resulting in better performance.
14 wraps sounds about right. However, the coil might be too wide, in order to fit into the atty. You have two options, use a lower resistance 0.3-0.4 Ohm, or use a 28 gauge wire.
What cotton are you using? I used KGD (Japanese cotton), till recently. I bought a pack of Cotton Bacon V2, to see what the hipe is all about. I've been using it in a couple of my RDAs for a week now. I'm impressed!
Money well spent! I'll switch all my wicking to it sooner or later.