the downrigger method i use is simple and effective!..it involves attaching a 4.oz to 6.oz teardrop lead on the line(the ones with the swivel from BCF) about 6 metres up from the bait.use an elastic band to atach it to the line..simple and less gear.when you get the fish and you are winding up and the sinker appears just pull the elastic band and snap it of...and its all free.
i like to troll with one down rigger and one on the surface as to try and cover the complete water colum and more options.the kayak i have has a dry hatch which i convert to a live bait tank with an airator.or use one of the collapsable live bait buckets available.
i normally catch about 6 livies and that lasts me.if 6 livies get me 6 fish then thats enough.i normally try to keep only 2 or 3 good fish for me and the misses for a feed