Have you guys used one armed swings - either top or bottom hand - to try and fix this. The good news, when I showed her the videos I took and slowed them down for her, one of the first things she said was 'look how bad my hands drop'. Both twins are actually really into 'learning' their swings, so that's exciting for me! They see and understand that even as successful they have been so far, they have a ways to go and many things to learn.