I put A Ronin's Path before the opening fictions - it features a character who is killed in Dark Hands of Heaven (Hida Tomonatsu). Either that, or a character with exactly the same personal and family names. She would be the only example of that, if it were the case.
The Clan letters are all after the Scorpion novella by about a month, I reckon. Before Imperial Gifts , perhaps?
For some reason I have A Simple Test right before the Wedding at Kyotei Castle, but I don't remember the topic of the fiction.
Fires of Justice is just before Fate of Flames .
Sins of Regret we have no context for really. I'm tempted to say it's before the death of the Emperor, since Imperial family daimyo reckon they can get away with things.