Can't keep Timing tape on balancer

I have tried with no paint as well. One thing I forgot to mention. I have been chasing a vibration between 1,100 and 1,500 RPM as well, could this be causing the tape to fly off?

I have a magnum 5.9 balancer, a magnum 5.9 flexplate and a neutral 318 converter. Is there something I'm missing? Could something else be causing the vibration?