I don't quit get why you are doing these sets, since the WSS sets can pretty much cover the AWI British (and most other European forces from that time) unless these guys come in shooting and charging poses for infantry (which would actually compliment the WSS sets).
As an Historian versed in the AWI period (among others) I nearly fell off of my chair when I read this. The differences in just the basic uniforms alone preclude any use of WSS figures as British, Continental, French or Hessians (Germans) involved in the AWI conflict. At first glance I can see how someone can make this mistake but, if I were playing the battle at Cowpens and someone showed up with WSS figures as any of the participants I wouldn't let them play no matter how well they were painted. I'm not a stickler so much for WISIWIG, if you have a 12-pounder cannon and want to call it a 3-pound grasshopper then go for it, I can give that much leeway but there has to be some sort of effort. I can also forgive someone painting up Continental figures in British colors (indeed, some Continental regiments early on had red coats) but there is only so much I can forgive as a player.
This isn't a slam or an "in your face" byandewalker, I know loads of folks who would make the same mistake on a cursory glance but upon a little closer inspection the differences really come out. If you'd like, I can suggest several books where you can compare the differences.
I'm still not confirming nor denying that we are doing AWI though. We could be doing Cthulhu/Lovecraftian sets.