From my experience with a Vortex getting the right packing method is essential. In the beginning I had some seriously crappy sessions until I mastered the pack.
Originally Posted by Hookah Newb
I'd pack it a bit more, I usually sprinkle it up to the outer rim then pack it down past the holes.
I use a similar method except I sprinkle the tobacco till it's just over the rim and then I pack it down with a fork until the holes are exposed.