Any thought to increasing the card count (4 for the Union, 6 for the CSA?) Pretty much all the scenarios from the original BC saw their card count plussed by on in BC150, and it would help alleviate the dead heads common with this scenario.
Also, I am very surprised that, at the scale of the scenario (roughly 1 piece per division), Chancellorsville itself is represented by a Town, rather than a Homestead. Historically, it was mostly a manor house with a few outbuildings.