I`ve been using (new) camered 8.5 - 8.3 the last 4 years as my big (lightwind) sails.
This year I got myself a 7.5 Ezzy Freeride 4 and it`s really very good!
I sold my cambered 8`s and the 7.5 is now my biggest sail.
(135 liter board)
If you send a request to Ezzy about your mast you`ll get a very quick reply.
By the way, my 7.5 is on a 460!