when trolling I only use 20 LBS braided with a leader of 20 or 25 mono or fluoro
I would not troll even on local lakes with any 10 LB line
10 LB line will keep breaking when trolling
10 LB is for drifting
if you are only using mono with no leader I would switch to braided with a mono leader
mono is a lesser line it stretches and makes the line weaker than it breaks
braided with a mono leader is far greater
using a dipsy your leader would have to be about the length of your pole
anything longer makes it hard to land the fish
E Bay has the lowest prices on line
Lures Pro has a thinner line for about 37 dollars for 1000 meters
after that the price goes up