Thanks very much for the help. At the sailing club last night I was given the very general advice regarding controls that it was very important to have a powerful kicker and cunningham/outhaul to depower the rig in a blow. As a new racer in a mixed fleet the advice was to enable me to depower the rig. Today still on my learning curve without adjusting the pre-bend I managed to bend the mast a significant amount and the cunningham moved the luff significantly. As you can see I am a beginner re set up matters.
John.