You have discovered the often talked about but never claimed to be at fault of front shifting under load. In a word "DON"T" shift under load if you can help it. Of course far more time will be spent seeking der adjustment/replacement and or ring blame then taking a mirror to their aspect of the situation. As time goes along the manufacturers are making front shifting more positive and able, at the same time the newer riders are not being taught the basics as to how to ride WRT shifting ease. Andy