@talkingskunk here you go:
https://drive.google.com/file/d/1n1eho1VkbhZmdhgpCYWfseW3UU1XtWb0/view?usp=sharing
Changed the rotation of the grass to be along the Y-axis and the Axis in the Particle Instance Modifier to Z. Also adjusted the Hair Length in the Particle Settings and disabled Hair Dynamics. Added an animated Turbulence for testing.
There are still a few vertically squashed grass parts, but that is because of your Vertex Group that you use to control the Length. If you let it only control the Density, then you are ok, but maybe this is what you want.
