Amongst the sails you mentioned, they only tested Severne NCX. Rigging it on a NP X6 mast makes it much less reactive. Adversely NP Hellcat improves in overpowered conditions when rigged on Severne blue line. However switching masts on Stealth and Vapor results in much less perormance. You should not have trouble if you stick to freeride and use a mast in same bend curve group than the recommended one. Ram/Overdrive may be a different story. A friend of mine never managed to get Overdrive's working properly on other brand masts. I'll send you the PM chart of last month if I can find it again.
Last edited by Farlo; 9th December 2009 at 07:19 PM.