No. That changes whether the turbine is pitching up and down on top of the post, but doesn't change the fact that the turbine shaft is pulled out (or pushed int

No. That changes whether the turbine is pitching up and down on top of the post, but doesn't change the fact that the turbine shaft is pulled out (or pushed into) the turbine with different force at the crossover point. That will create vibration even more in the long-post model you describe.