I always JIG for Ling.......that way you can get in the tight spots and choice places where angels would fear to go with a downrigger.
Most of the places where big ling hang out is not where you want to be with a downrigger anyhow....
Fishstalker....look for places where there are rocky reefs, rocky outcrops, good tidal/current action androcky ledges and dropoffs in depths from 40 ft to 150ft.......(past the ledges and dropoffs can be deeper than that but alot of times the Ling are where their food is...which is shallower places less than 150ft deep.)
if said place has a strong current running through it (which Ling like)......wait until it is slack tide and then put a jig down.
or pick one of those days where the total days tides does not fall or rise too much...and then fish the spot.
If not, a lot of times you can go out to the place on a slack and fish the the first 1/2 hour of a flood tide when the water starts to gain momentum.....a lot of times this turns them and they'll hit savagely.......