You could try to make the joint more conical than cylindrical, that way the paper opposite from the roach shouldn't wrinkle or crease. If you twist the end opposite the roach after you're done rolling, it won't matter too much how loosely packed the herb is in the cone section because you're basically removing the excess paper when it's lit. It's a little more forgiving to start the rolling process with a cone in mind, I think. You just work from one end to the other and it doesn't matter if the end opposite the roach isn't doing the same thing as the end around the roach, because that's not how you make a cone anyway.