Using 24 in Funnel smoke I missed the carrier, its late, but hit 2 escorts. the remainder followed set course, which in the real world would be right, so no units hunted me.
Using 24 with Military convoy at periscope depth 2 of the RNs finest came on at full tilt pinged a few times and that was it. I got into the convoy at the same depth, with DDs still covering me, sank 1 merchant then sailed with convoy at same depth and had about 5 5DCs dropped in the whole engagement
From what I know, which is not a lot

if it was only a suspected contact it was attacked and dont worry about the expense
The KISS method is the best.