After sailing, always release your batten tension. Never leave sails fully rigged for long periods of time. If your sail is to be left rigged, release the downhaul and outhaul until the mast has no bend. It is also advisable to unhook the Power-on Head elastic during extended periods of rigged storage. Make sure th batten tensioner is completely released while snapping cam on.
Camber batten too tight, release a little batten tension.
Cam is over-rotated, need more downhaul. Mast diameter is larger than normal, lengthen the webbing straps on the cam. Mast is too stiff, check that you are using the correct mast. Sail is too flat, try less outhaul and less downhaul. Mast is too soft, check that you are using the correct mast.