Very interesting. I've run/gamed this scenario a few times. Both sides have won...
But I'm curious...I see you've amalgamated a few of the British/Loyalist units. The OOB I use has Majoribanks' elites split into smaller Grenadier and Light battalions, the 63rd and 64th Foot into their own battalions (with the 2/84th amalgamated into the 63rd Foot), and the loyalists into 2 battalions (DeLanceys'/New Jersey in one, and the New Yorkers into another). I even split the 3rd Foot into 2 battalions (really wings of the bigger battalion - I know, but It seems to work).
But I've not played the rules you use. Do the larger British Battalions you use play well? I've used a variation of Gettysburg Soldiers (playtesting their new AWI rules) in my games, and the smaller units work well for those.
Either way, nicely done. It's a great scenario...