Here's my follow up. I decided to change the ejuice (Or3o by Ben Johnson) that was originally in the tank to Halo Purity's Malibu juice. The Or3o has a more sweeter, vanilla/chocolate type flavor while Malibu is more of a menthol/pina colada flavor. After the change, the Protank improved immensely! I can now taste the menthol and the subtleness of the pina colada. The vapor quality continues to amaze as well. Can anyone further explain why this happened? Does this mean I can never use my Or3o flavor or anything else that has a vanilla/chocolate flavor?
No, it means that you have just discovered the legendary quality and purity of Halo's eliquids. They are unequaled, in my opinion. Other vendors' juices may be tastier or more popular, but Halo makes the purest product. When I test new heads, I always use Halo's Menthol Ice or Truepure. I know exactly how those juices should taste and I know that they will never clog anything for a long time.
Any flavor that is dark, gooey, sweet and strongly flavored is an atty killer. You don't have to give it up, but you'll have to change and clean your coils very often.
Halo makes very clean chocolate and coffee flavors. I don't think I've tried their vanilla--not a big vanilla fan. There are many other juice makers who try to make clean, clear eliquids using as few unvaporazible (that a word?) additives as possible. Look around, read Juice Reviews, ask questions. The more people demand clean eliquids, tho more vendors will provide them.