Hi Dave
I suggest you look through the Yahoo groups on Nieuport replica building: the Nieuport builders group, and the airdrome builders one. In addition the Dawn patrol website is a good resource:
The Dawn Patrol Homepage
The Dawn patrol books are written for their entertainment value rather than in-depth discussion, but they do discuss the incidence/sweep and engine issues as well.
There are many other online resources such as the Noon patrol:
Noon Patrol Builders Reports
and Wright patrol:
Wright Patrol Home
Many US builders have a 'build it and see if it flys' attitude and so are somewhat short on technical analysis. I posted to the above forums a year ago in an attempt to obtain and compare the sort of data you are interested in, and got no response whatsoever.
Just be aware that many builders have made important mods to the G Lee designs in order to strengthen the lower spar carry through: the original aircraft had a bit of an issue with this as well, but as one WW1 pilot remarked 'it flies perfectly well without the bottom wings'!
Good luck with the build