The troopships are tougher when the convoys are better designed. They can steam much faster, and they can zig-zag, too. That makes hunting them harder.
The benefit of the "generic" ship entry in the missions is that the same convoy can pass you twice, but look a little different. The down side is that a convoy would ideally be organized around compatable ships, not 4 ships than can make over 20 knots, and one that does 10 at a dead run.
tater
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