From talking to guys in your area, if you are fishing the Delta and not fishing at least SOME with a rat bait then you are missing out.
WRB is right about the A-rig. I dont consider that swimbait fishing really either.
Also, you say you only catch one or two per trip? You dont really say how big they are, so that may not be a bad thing. You're gonna go and not catch fish, accept that. If you are fishing for big fish (and honestly on the Delta I dont know why you'd fish for anything else) then you have to realize the only way to catch fish on swimbaits is to keep throwing them in high percentage areas. Gotta keep a bait wet to catch anything on it.
So Matt, about that rat bait? LOL