For jigging i like 6lb fire line
for drifting harneses i use 10lb fire line
for trolling i use 30lb fire line on my dippsey rods and jet rods
i have hooked big steel head on 20lb fire line with dippseye and snapped the line on big runs so i switched to 30lb no problem
and the big water trollers bible also refers to the 30lb fire line
on all of it's depth charts so this made it an easy decision