Where are you & crew positioned as the tack takes place? Generally you should move aft on the windward hull just as you start the turn. Do not jam the rudders over hard, let them carve your turn (just like in downhill skiing) as this maintains speed. Do not let the tiller go through any point in the turn, keep applying helm, increasing the angle as speed drops. Keep your & crew's weight on the aft windward corner until the bows are through the eye of the wind and heading off wind. The point is to raise the bows a little, effectively making a shorter water line and to create a pivot point on the windward transom of the boat. The crew will generally want to scrable to the opposite side asap...this is wrong. He/she can do all the jib tending needed through the turn while positioned on the windward aft section. As you come to head to wind, ease out the mainsheet to as not to go into irons and aid bearing off on the new tack. Get the jib sheeted and pulling in on the new tack first, before sheeting in the main.