>>885963>>12-15 feet of 30-40 pound mono as something to hold on to during the double haulthat would be called the "running line" for running line I use 50# rio slick shooter. its a oval mono made just for that, its supple stiff, comfortable on the hands, absorbs shock, has very little memory and shoots incredibly well.
sorry i didnt mention the whole running line ,shooting head, shooting line stuff in the first post. What you are proposing will work, i would go higher on the mono or buy proper running line. If you get snagged far out and have to pop it out you dont want a weak link. 30lb mono is stretchy, you dont want to lose your shooting head. fg is a good knot.