Sailed both Reflex + Reflex II in sizes from 5.1 till 7.8. And regular discussions with many other Severne racers. And some of them even use NP masts instead of severne
I can confirm neilpryde X6 might work for you, only the sail will get more lift. This is good for bottom-end of the sail, and a bit worse for high-end. Sailing a slightly softer top makes the sail easier to handle for most riders (read: possible to sail with smaller size). Especially on flat / gusty water.
I use the enigma 2011 masts which gives really big range on the sails and good balance between profile/lift/drag. Its not always the best solution the recommended mast, but still good enough to compete in any condition with enough performance. Like F1 cars and their tactics around the tires useage.
If you like to change from NP to severne its not instantly needed to change masts etc.
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2011 Starboard iSonic woodcarbon 107, iSonic speed special W54, iSonic speed special W44
Severne Reflex Sails