Ok, I see that your setup is significantly different than mine. I was assuming that your pole was part of the fence supporting structure like mine rather than an independent, free standing pole. As for the weight difference on the Davis Vue vs the AW all I can say is that comparing the VP2 Plus to either my original AW WS-1400 or the later WS-2902 station is like comparing an economy car to a bus. My Davis hardware is significantly heavier and WAY larger than the AW hardware it replaced. Granted, you are considering the Vue rather than VP2, but still the pole you are currently using may be questionable for the Vue hardware. Depending on the prominent wind direction in your area, it might be possible to guy wire the pole to either the fence or the ground to stabilize it in that plane.
David