Had a similar situation on my boat-the forestay tension seemed to allow a bow in the luff. DON'T start by tightening the forestay.
The only way you'll know what you've got is to loosen all the rig and start back with the shroud
and back stay tension. Get your mast
rake set and then check forestay. There is s good book by Ivar Dedekam available in electronic and paper called "The Illustrated guide to sail and rigging". Read FIRST tension last.
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