How are your work commitments going? Still busy? I remember one bug in the original implementation, in case you want to check it out. The calculations for casualties and victories were wrong once a game was restored. That is, if you saved a game before a battle, fought the battle and then restored the game to the previous state before the battle, the spreadsheet did not restore the data, however, and considered the battle as being fought, thus modifying the stats by a battle that was never actually fought. Therefore, saving and loading could absolutely destroy your statistics as the data did not return to their previous state along with the game. And you could do this again and again...
I don't know if that is an issue of the WOTS or the Midnight engine, I think of the former, but it was something I noticed. I hope this report helps.