I've only used a 6.5m NCX with a 40cm c3 venom fin. I think the sweet spot is between 6m and 7m sails. Your sails should be fine expect for the 8. Do yourself a favour and get a couple of venom fins. A 40cm for the 7, a 38 for the 6 and maybe a 36 for the 5.4.
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