That might be a good time to complete your turn however i do not believe it will stop the fissures, it has to be a fast drop and it has to be smooth, lots of silicon spray on the chute mouth, make sure all the ropes are clear and the spin halyard runs freely, I sail a I17, main, self tacker jib and 21sq mtr spinaker, I sail 1 up so when dropping the spinaker there is NO helm, so my drops arent always done at the pristine moment, I do not have fissures there, you will have a small sharp barb some where doing this, tape everything! Check the chute plastic dosent have a sharp edge, the 1st patch is too low for the spreaders to cut, check the metal rings further up the spinaker they may have a small barb, feel your frontstay if it dosent have plastic coating and the junction where jib is tied down to bridle, look for where ever contacts the 1st patch and you will find your culprit,
good luck