This week end was unbelievable for Donzi testing for me added a new From Mad dad I believe to be hydro motive nose cone to a 280 drive the boat developed an un believable violent chine walk so bad I could not control the boat. Started about 3500 RPM 45 MPH. Tried pin locations and other props no change. Removed it and back to normal. Also discovered using different props found my torque steer to the left rather than right that it has always been. Both I and Mike are boggled. I have had this boat for 44 years never experienced such lack of control Scary!