RE: superstar 40 CG problem
I think the source of confusion here is there is actually 3 different flavors of the superstar, each with individual specs. There's the RTF version, ARF version, and the AWARF (all-wood) version.
Tower hobbies web site has the right CG figures and control surface throws for each flavor of Superstar, last time I checked. Or you could check out the Great Planes/Hobbico site.
HTH,
-Matt