barbel bites are usually wrap rounds and tend not to be plucks, due to there mouths being under-slung , depends on if want to catch fish or just barbel , for me personally I would try and nail every bite no matter what , because the way I look at it the more recasting i do the more bait goes in the more activity in the swim to attract other fish , maybe put some micro pellet in with the maggots and fish a large pellet as change bait ,sometimes the tip will tremble like a minnow bite ,can mean the barbel are in the swim .