I have to agree with Doug. I was going into irons about half the time with my H16 until I started uncleating the main just as the boat rounded into the wind. It will work as a wind vain and keep you pointed in irons if you don't. Shifting weight to the back to get your bows out of the water will assist a little to help the turn. As you say you are sailing a uni-rig there is no jib to back wind, so speed, tiller control, weight distribution and main sheet adjustment are your tools. I was lucky in that I attended a seminar put on by TCDYC last spring. Chris Green came along side each cat in a power boat to observe and critique our skills. You might try to find a local "pro" in your area to help you this way.