Unless I'm mistaken I believe I've read that the Nhaler HV liquids are mostly VG based, or at least contain quite a bit of it. The only way I can get that much vapor out of my own creations is to add a lot of VG.
I have samplers of most of these and 30mls of a few, and they are very thick.
Going to be trying this mod this weekend, been using many other PTB's just not sure on how big to make the slits on the straw.
Hmmm..didn't think of that! Would explain why they are so thick, lol! I learn something new every day. Thank you, grasshopper!

(I make the notches about 1/4" - no more than 1/3 the length of the cart.)
Just wanted to give you all an update on my previous question about this mod working in a m702 cart (although it seems like I'm the only one in the world who doesn't have a 510 lol).
I'm pleased to report that this works great in my little 702 carts! ^^ no leaking whatsoever (as long as you don't overfill it). You don't even need any straws at all as the inner carts or so tiny, they hold the PTB in place just fine. I basically just have to remove the inner cart and stuff the PTB inside with a tweezer, cut off the excess and put the inner cart back in. Works great so far ^^ no leaking, good vapor, drains pretty well! ^^
Cool!