Tactics for fishing plaice on the shambles are drift fishing with the same kind of gear you would fish with from Poole, perhaps slightly heavier as you will need a little more lead there to combat the larger tides. 12lb class rod or slightly less is ideal, matched that with a 6000 sized multiplier perfek. Beads, rauto or delta type spoons, booby beads all wok on there day. You will also need a nice big bait which can consist of rag, lug, squid and crab in cocktails of your choosing. If your trying for a Turbot or Brill then a nice long slither of mackerel or a fillet of Launce should be on the menu.
As you say get your drift speed right then you have to fish your tackle on the bottom but not with so much weight that it stops and you end up dragging it along. Your gear should ideally be going out the rear of the boat and you should feel it bumping bottom. Dont forget to have a go for launce on the slack water, there should be plenty of them about from now onwards and they make excellent bait.
Thats basically the way we fish but Im sure others will ad there fav method
Martin