I don’t see how you are getting vibration from the pump with poly pipe underground. The poly should be flexible enough, like a rubber hose, to keep vibration from transferring.
You may have a resonance problem. Sometimes just adding or taking away a couple feet of the drop pipe in the well will solve this problem. If the drop pipe is exactly the same length as the resonance frequency, it works like a tuning fork. Making the pipe a little longer or shorter changes the tuning frequency.