So was trying to reply to other peoples issues. After literally 2 hours, I fixed issue with protank being extremely tight draw. Think of trying to drink a milk shake through a coffee straw tight. Was using a Kamry K100+ mod, but see others have had same issue on other mods. So, here's the thing. The connector on the coil that touches the battery has a section that should be cut out. Turns out, mine was almost flat. Here is a side by side picture of a good one vs a bad one. Good one has green arrow, bad one has red arrow. Sorry my phone doesn't take best pictures, but the good one is probably twice as deep, and gives a more airy draw. Red arrow one is impossible to draw through when tightened, and hard to draw through when loose (not to mention, feels so lose it's about to fall off)

Hope this helps others.

Hope this helps others.