Take into account that you have to draw air across a longer distance so you almost want the joint to be a little looser during the first half then the last half can be a little tighter. Get a good form on the joint then if you have to "back it up" like a typewriter (I wonder how many people have actually used a typerwriter and had to reverse feed the paper back out). You know you roll it up and get the good cylindrical shape on the pot, go back down with the paper and if you have to, slightly jab at the pot near the fire end to break it back up slightly, then roll that half up a little more tightly. Tends to make the joint look a little unsymmetrical but it hits better.

That explanation was if you are rolling two papers left to right (which is what it sounded like) and not top and bottom.