String gauge change for CGG?

I've revisited some of Jean Ritchie's material, including tuning CGG. For a lot of the songs this tuning fits my vocal range better. If I stay in CGG, should I change the string gauges, and if so, to what? I'm playing primarily a McSpadden (28.5" scale) and a Blue Lion (26.5" scale). Obviously the melody and middle strings are currently too loose - I think I have a .010 melody and .012 middle. Thanks!