I've caught several trolling the outside of the bar with deep divers (red and white or mackerel color). I haven't tried anything else, but put some spoons out too and you might get into some spanish or king.I don't have a tower either and went once early last April and caught one trolling.
I'm thinking maybe slow trolling some rubber ell's. Maybe one just under the surface and one on the downrigger, 4 or 5 feet down. Anybody have any thoughts on this. I'm not trying to take over your thread Mikvi, just generate some info. Like i said i've been wondering about this myself.
It's funny everybody thinks you must have a tower on your boat to catch ling. That's only if you want to sight fish. Far more have been caught pulling christmas tree rigs w/ cigar minows. Just ask any old timer.