The blue foam is a pain, and leaks like crazy. The standard fill works fine so long as its not too dense or too light. Pull the filler out of a blank cartridge. Now you see whats in there. If that amount doesnt work, lighten it up..pull out 1/3. and so on. The density of the filler, REGARDLESS of filler TYPE will determine how fast you can vape. SO forget the cart mods, and new fandagled fillers. Youll get same issues with them all until you nail down the principle of batting density. Batting just needs to be EVEN top to bottom of the cart...it comes from the factory bunched at the bottom. Thats why it never flows right.
Im a 2 padder..or was a year ago..now chain vapor, and never use cart mods. I just pull out 1/3 of the batting in a fresh cart, and works like a charm for a solid month till I replace the whole cart. The only varience to this is the thickness of the liquid used. This part you must figure out, unless you use johnsoncreek liquid as I do. The thicker the liquid, the less batting you need.