Ryobi Reeleasy line trimmer head PROBLEM

I have a Ryobi petrol line trimmer with curved shaft. Installed reeleasy head what a fiasco! Spool is correct way, line is wound in by turning orange knob counter clockwise. When trimmer is started the springiness in the drive shaft allows the head to oscillate a few times & the inertia of the spool winds the line IN. Once this happens the only way to recover the situation is to remove the head, & line, & reinstal both. After about 10 times it may start smoothly & be O.K. & bump feed O.K The idea is fantastic if only I could get it to run without sucking the line in.