If you are fishing with SP's slow your retrieve down for bream, especially more so if using anything from the gulp range.
When using a live nipper you aren't retrieving the nipper back, it's just sitting there bobbing around twitching his tail and attracting an inquisitive bream to him. The same needs to be done with a plastic lure. Give it time to get in the strike zone, it may take 5 - 10 seconds or sometimes more, depending on jig size, to sink to where the SP is effective after casting and hitting the water. Once you feel the plastic is where you want it, then start to "work" the lure depending on the type, it may mean just little twitches in the same spot (for worm types) or it may be a case of bigger twitches and small jerking actions as is the case with minnow type plastics.
Most importantly, most of the time, is to slow down your retrieves when using most plastics for bream and even when using some HB's as well.
I'm no expert but I do find that this has helped me along the way when bream fishing.
Hope it helps you out.
EDIT: You can watch DVD's on fishing till the cows come home but time spent on the water using that info in a practical sense is much better.............obviously.
cheers
Hooiky