I think I have finally solved the PT2 issues...... I had a lot of luck with the first, eh, 20 something heads I got, 1 in 5 were leaking, gurgling, whatever. I burn my coils to clean them, so I don't know yet how to make my own coils. 
1. First I replaced the wicks with boiled bulk cotton....ok, great improvement.....for a while...
2. Took a suggestion on turning the silicone ring/cup of the stem, turning it upside down and replacing it back on the stem (chimney), yep, great.....for a while.......
3. Final modification and it has yet to fail me. "Double cup it"!!!!! Leave the original cup pointing down on the stem and add another pointing up on the stem. This is working! I think the whole deal is between the actual stem and the draw tube you channel the stem into after you refill the PT2, it's not snug, tight, whatever, and juice is sucked into the draw tube through the surrounding gap.
And I took a pic to you could actually see it!

Yep, it's working like a charm, no gurgle, no juice suck, necessity is the mother of invention!!!! To say nothing that I have 2 PT's and 4 PT2's that I'm not going to throw out.
PS. And you can vape that puppy almost dry, no refill at the 1/3, 1/4 mark!!!!

1. First I replaced the wicks with boiled bulk cotton....ok, great improvement.....for a while...
2. Took a suggestion on turning the silicone ring/cup of the stem, turning it upside down and replacing it back on the stem (chimney), yep, great.....for a while.......
3. Final modification and it has yet to fail me. "Double cup it"!!!!! Leave the original cup pointing down on the stem and add another pointing up on the stem. This is working! I think the whole deal is between the actual stem and the draw tube you channel the stem into after you refill the PT2, it's not snug, tight, whatever, and juice is sucked into the draw tube through the surrounding gap.
And I took a pic to you could actually see it!

Yep, it's working like a charm, no gurgle, no juice suck, necessity is the mother of invention!!!! To say nothing that I have 2 PT's and 4 PT2's that I'm not going to throw out.
PS. And you can vape that puppy almost dry, no refill at the 1/3, 1/4 mark!!!!