Never had the issue on a street bike before. Try taking them off and cleaning them and the bars really well. A lot of times guys lube them up good to be able to get them on, my guess is that yours may be full of lube still. On dirt bikes we twist wire all the time. It works just fine there, but those grips tend to be a little softer. Also, if you twist wire, place everything with intention. Sharp wire ends can ruin your grips and palms. You could just put bar ends on too, but that wont stop them from twisting if they are.