Just a few comments
Mim : when using a 15% carbon mast you loose half of the performance no matter you use Element, NCX or Gator
I have most experience with Gators up to 6,5 ( get a 7,5 (09) in a few days), huge trim range, from light wind wave to slalom performance.
I can highly recommend the Gator sails, but I have tested some NCX sails and they are very good to.
BUT I use normally Red Line masts in my sails.
So I strongly recommend using a high performance mast in these sails.
Blue Line masts work fine to; they are a bit softer than Red Lines, so some prefer Blue Line Masts, even in Code Red sails (up to 460 cm). Depends on rider weight and style.