Is there a way to prevent z-fighting of planar instances generated using Geometry Nodes?

Random distance doesn't space my planes far enough apart from each other.

Maybe there is a way to implement Poisson Disc distribution for the Z axis?

Or maybe there is a way to space instances *equally* on the Z axis?

The black spots are the result of planes z-fighting:

<img src="https://i.sstatic.net/ybwuJ.jpg" width="512"/>

Here is the node setup, which modified from [an answer by Hulifier](https://blender.stackexchange.com/a/265039/2952):

[![Geometry Nodes setup for billboard particle style instances][1]][1]

This area is probably the place to pay the most attention to:

[![Nodes that determine height][2]][2]


  [1]: https://i.sstatic.net/9mo4p.jpg
  [2]: https://i.sstatic.net/kkOnr.png