So what to do? If the boat is new, take it back and let the dealer or manufacturer handle the matter-you should not have to cope with their mistakes. If it's your problem, caused by repowering (and increased speed),adding weight forward, or removing weight aft, or by adding a cockpit to the stern (shifting the relationship between center of gravity and center of planing surface), there are a few possible remedies. Sometimes hull appendages, such as struts, rudders, bottom strakes, and even transducers, contribute to instability, as do poorly shaped propeller tunnels, but these are more difficult to diagnose and cure. Be aware that they can be part of the problem. Since instability is often caused by a combination of factors, it can sometimes be managed by a combination of solutions, many of which involve little cost.