You can use 30lb, I do. You can use 40 some guys even use the rope of 50lb big game. I put a 12-20 lb flouro leader depending on what lake I fish maybe 30 feet, then blood knot the 30lb for about a 100ft, then blood knot that to my main 14lb XT. Don’t worry about the downrigger let it chew it up as it’s coming up if they happen to be on it.