You were hoping for too much.
Given past experiences with SHIII & IV, it takes 4 patches to get the game up to an acceptable standards. IIRC, on SHIV, it was patch 1.4 were the finally fixed the convoy bug. You hit one transport and the whole convoy dropped to .05 knots(essentially stopped). Then again that might have been patch 1.3.
I just hope Ubi gives SHV four patches.
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