The thinner the line diameter the less water resistance you will get and the deep a crank bait will go with everything else being equal and only changing the size of the line's diameter. I guess thicker line diameter make the line cause more friction with the water. Line's cutting thought the water creates friction and resistance with the water which make the line stay up in the water column more.
Reduce the Outside diameter of the line to go deeper with the same crank bait and the same pulling force and the same amount of line out behind the boat.
Check out the Precision Trolling Book to see how line diameter affects just how deep a crank bait will go while being trolled at the any given boat speed.



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