By far the best luck I have had with plastics is on flathead although I can't think of many fish that are yet to be landed on a plastic (worth catching anyway). As with all lures, you need to work them, despite various manufacturer claims plastics are not like bait (in my experience anyway). Technique is important, but more important is 'where' you are fishing them. Unlike bait, fish aren't going to 'search' for a lure as many would for a bait that they can smell, thus if you don't put it right in front of them, they will never find it. The type and size of lure you use is also important.
When targeting flathead, you want violent jerks with long rests in between (5 seconds or so). My standard retrieve is to wind in the slack, until you feel the lure move, then give it two violent jerks to lift it high off the bottom, then just wind up the slack and let it sit for 5 seconds. Most times I find the flathead hit it either as it is sitting or just as you start to move it. Colour wise I like 'natural' colours, but also on occasion bright pinks, oranges and red is dynamite.
Salmon are dead easy on plastics and awesome fun on light gear. Choose a lure with a bit of a tail to it, then just wind it in. If the fish are on the surface, start winding fairly quickly straight away, try and get a bit of splash on the surface. If they are deeper, give the lure a couple of seconds to sink, then retrieve, give the rod a few flicks as you are retrieving.
Whiting are fairly rare captures on lures, though by no means unheard of. Using plastics for bream is also popular, but I have very little experience. From what I understand you want very light jig heads, slow retrieves but lots of twitches and small but violent movements. Also you generally need to fish very close (within 1m or so) to structure, boats, pylons, bridges, etc.
Best of luck, Dave
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