The decoys/bolds are good for iritating a DD. Releasing one bold increases your chance to stay undetected for the duration of the bubblescreen by 50%. But it attracts a second DD to investigate the area. If you release a second bold a third DD will show up and search for you and so on.
One lonely DD is distracted with one or two bolds and you'll have time to move away.
DDs of an convoy escort screen will call for help if you release a bold. May be useful after some time dealing with only one watchdog. The second DD will need some time to reach your position and you'll have better chances to get rid of No.1. Still close to the convoy maybe not the best option.
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