There's some great info here, I'll add just a couple of things...

The diameter of your mainline has a lot to do with how deep the Deep Six (or any diver) will dive... I'm guessing this is why Dogfish is using braided (I'm assuming Spectra) line... it's got a much smaller diameter per given pound test rating than mono does, hence less drag in the water, hence the diver will dive deeper.

The other thing I'll add is that with a levelwind reel, I find it a lot easier to estimate the amount of line I'm letting out by counting the number of times the levelwind goes back and forth... First, let out enough line so that the levelwind goes across just once... measure how much line this is... say, 10 feet... (about right for fully-loaded a Penn 310) then you know that if you let the reel freespool and let the levelwind go back and forth two times (four passes), you've let out ABOUT 40 feet of line... it's not exact, but for me, it's easier to count to 4 than it is to count to 20... (plus, I don't have to take my shoes off ) Whenever I try to count pulls, I inevitably get to about 15 pulls and something will happen that distracts me, and I lose count... I also find it easier to teach beginners the levelwind method, and it's the same for everybody... whereas 10 pulls for a little kid (short arms, not paying 100% attention) might be different from 10 pulls for an adult.

Hope this helps,

-N.