Or should I quit trying to analyse things so detailed and get the sinking line, get the LC-13 and go out and figure out what I need to get down close to the bottom?

And my best bet, if I am thinking right, would be the LC-13 for cost and simplicity. Cut it for shallower, leave it for deeper.

And one other question, will a WF/S line turn over a 30' sinking tip like that? Not considered a shooting head if tied directly to sinking WF line is it?