What Seth said, you really want to avoid the English Channel at all costs. It's crawling with warships and the depth makes it problematic to make a clean getaway. Once a DD starts hunting you it's also usually just a matter of time before more ships show up on the scene to make your life even more difficult.
As for the damage report saying decoy launcher destroyed I've seen that message more than once long before Bold is available. I think the damage report is just telling you that that area of the sub has taken a big old hit, so the area around where the decoy launcher was is trashed; and if you were later in the war it wouldn't work anymore. It's just one of those things really.
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