I just bought 2005 Crestliner 1754 Jon with steering. I have a 2003 Merc 40 4 stroke on it. The problem I am having is when I turn with the motor acts like it stops gripping the water and I have to slow way down with it to get it to start taking hold again. This is happening at cruising speeds 20 mph or over. It don't have to be a real sharp turn for this to happen either. This boat has the 1" tab all along the bottom and I'm wondering if it's causing a problem. Anyone have any ideas? The motor is a long shaft and the boat has 20" transom. The motor is as low as it will go.