Not an expert for this as it's never happened to me but you can keep tying down but if you can't do that no more what's that thing they do when they slowly bent other a branch ? Don't know the name but I've seen it in a lot of scrog grows to keep an even canopy.... Super cropping that's it anyways here a link tut on YouTube should be able to find some on the forums aswell http://m.youtube.com/watch?v=vacg2FZWtrk