Large amounts of water in your hulls cause all kinds of handling problems. Its a matter of weight distribution or the fact that the weight constantly changes. As that 8lbs per gallon of water in your hulls gathers at the back when you attempt a jibe, the boat gets low in the back and Ive had the wind get under the boat and tip it over. The boat will be sluggish and more prone to turtle. You can find any major leaks by lightly pressurizing the hull with a compressor (5 lbs or so). I had my kid make a hand seal with the air hose at the drain plug while I wiped the hull down with soapy water. Hull problems were readily apparent.