Hi
Drifting techniques and rigs depends on the marks involved so I am assuming that you are over sand or mixed ground at worst... try using a watch (circular with studs)lead to help stir up the bottom, and a flasher spoon on the final hook snood to get curious fish interested... http://www.sea-angling-ireland.org has a lot of information on baits and techniques available under the bait section and also under each of the individual fish species listings - it might give you some ideas. Size 4/0 might be a bit on the big side for flatfish especially sole although it will hold any decent bass. In fihsing a new mark, we would use 2/0s unless we know there are bigger fish about... Don't recommend any live baiting as it gets anglers into bother with the anti-everything-that's-fun lobby but you could add mackerel strip and pilchard oil to your rigs to give you a scent trail. Remember that Ragworm work as a bait based on their wriggling movement i.e. work best in clearer waters, which is not the kind of water you are likely to find over sand or mud in a strong current... I am assuming you are drifting at a reasonable slow pace - if you are fairly skimming along, try using a drogue anchor to slow the pace of the drift. As for the lower to the bottom and retrieve, excellent advice from the wreck fisherman above me, but it depends on the depth of water under the boat... there is little point in retrieving and dropping off if you are in only 12 feet of water... I live in the west of Ireland and here the drifting is usually done over reefs for pollack, haddock, cod etc. and that is very foul ground indeed. FWIW...