To answer your question about the runs: yes, they are wide enough for a GS ski. The groomers there are really fun; Geant is a great run for a GS race ski (along with about 60 other trails).
Some more stuff to think about: it will probably be crowded on some of the days you go there, and I don't know how comfortable you feel charging on a GS ski on crowded slopes. Also, there are a good deal of bump runs there and some nice glade areas suiting to all levels of glade skiers (not sure if you are into those), and I'm pretty sure your GS race ski wouldn't be the best of those. However, most of the trails on three of the four mountain zones there are groomed and suitable for GS turns.
My own two cents: if I could choose from all of those skis I'd take the progressor.