I may be wrong here but,
I think that TDW could not adjust the IRAI mod by date. So we had to have impoved escorts and anti-uboat tactics from the start of the war or not at all.
For the message "u-boat spotted" - I think that your boat is not spotted. This was added by the script scanning a distance from your boat and detecting contacts. If contacts were found there was a %chance that they would send a message "spotted".
I have not yet read the note from patch 6.3.6 but I think there are options to reduce or even stop this from happening.
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Trevally Mods for SH5
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