Last Friday while on a three day kayak trip I had a very difficult time keeping my boat on a reasonably straight course. I was getting pushed around by big swells, wind and waves. On all three days that I was out on the water I noticed that the kayak would track well on flat water (rudder up), and steadily go off course as the water became rougher. We were riding the tide and the wind was at our backs. Every time the boat rode over a wave I would be swept right or left just after it peaked. I started the trip with my rudder up but put it down as turning strokes were becoming ineffective. Conditions did not permit edging or leaning (6 to 10 foot seas). Even with the rudder down it was a constant battle. I also noticed that the bow dipped well into the waves as I was riding up and down them decreasing stability. The kayak by the way is a Wilderness Systems Sealution II. It was loaded with gear and with me aboard the total weight was probably around 250 lbs. Should I expect the boat to track better under the above conditions? Does anyone know of any similar reports with the Sealution II? I think the problem is the boat design and perhaps the water line length in relation to the beam. I would be interested in any thoughts or opinions. Thanks.