I think if you want to try the blue foam, you need to be careful. They coat that stuff in chemicals and it needs to be thoroughly washed before using. I'm not sure then I'd trust it, but then, I use no cart mod, have no problems, and only use polyfill.
I'm pretty sure your taste problem is that you are using VG liquid and VG gives good vapor but it really lowers the taste of the flavoring in the juice. If you like vapor, want a smooth VG taste, but also want great flavor....go to Nhaler and try their juices. They have the high voltage (you can use them in any PV not just the 6v) in 12mg nic and the other juices in 12 or 24. I believe their lung juices are also in 12 or 24. They must put some VG in with their PG because their juices give great flavor, great vapor and are smoother than pure PG juices. You can get 6ml samplers to try them out.
As far as the polyfill, the trick to filling your polyfill in the carts is just to put enough in there to keep the surface tension between the fibers of the polyfill and the liquid. There is no need to cram the cart full. And yes, the polyfill should stop before it gets to the lip of the cart, it should not be stickly out beyond the lip. Some prefilled carts come too tightly packed, I just take the scissors to their polyfill, snip a little off the sides and pop back in. It makes it easy to get the stuff in, and you can tell when your cart is full of juice by just poking the filler aside a little at the top with a toothpick. And you can get a roll that will probably last your lifetime for $6.00.
