Make sure the sail has NO downhaul tension and is outhauled fully before snapping cam on. Sail is too deep, try more outhaul and downhaul. 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.
Camber batten too tight, release a little batten tension.
Cam is under-rotated, need less downhaul. Camber is over-bending, need more downhaul. Mast diameter is larger than normal, lengthen the webbing straps on the cam. Leech is too tight, try more downhaul. Ezzy Sails, USA .