Settings to improve reflected water caustics

In the pool sample project for the UE 5.1 Caustics branch I’ve added a Spotlight and enabled Water Caustics but the quality is extremely poor.
Out side of the settings on the light itself which I’ve changed, how can I improve the quality?

There are 2 water caustics type to cover each scenarios, you need to make sure the water caustics resolution is large enough to cast sufficient photons, you can visualize those caustics photons to check if they are sufficient to fill in the scene.