Either way, the solution here is simple: OOC messages should be caught by torture reports at exactly the same rate as IC messages, but they should not count against the number of total messages to be caught.
Thus, if you get 1 OOC message in a torture report, you will be guaranteed to get 1 extra IC message as well. And if someone's trying to send IC information in OOC messages, all they will do to torture reports is make them more informative.
This is not a trivial fix, I suspect, but it should be the kind of thing we can do alongside converting torture to Doctrine.