I don't radio in a convoy contact unless:
1) I'm armed and prepaired (crew rested) to do serious damage.
2) I'm out of torps and I want HQ to send me home.
Anything else and I decide if I will attack the convoy or not and move on with no radio call. Contacting HQ could be counter-productive as you're likely to be told to attack and failure to rack up the objective will count against you. I also have to weigh the radio call against the risk of discovery.
My experience is the contact report is only good for one thing. Going home. Using it is too risky against the potential rewards.
-Pv-
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