To set the vertical position is a bit more difficult, the shadow is sliding up and down and simultaneously stretch larger and smaller.  Set the base Y position at 35 pixels (from the top) and subtract the sum of ‘y1’ multiplied by —0.3.

Set Property ("/shadow", Y Position) = 35-(y1*-0.3)

The stretching-part is a bit like that too. Set the percentage of the Y-Scale at 180% and subtract the sum of ‘y1’ divided by 3. 

Set Property ("/shadow", Y Scale) = 180-(y1/3)