This episode explains the steps I'd take to change greens from too hard (surface hardness and ball bounce, not hard as in difficulty) to just right. It follows that the opposite steps could be taken to move greens from too soft to just right.

The blog post discussed is https://www.asianturfgrass.com/post/to-keep-green-soft/
The ball bounce video from Dan Dinelli is at https://youtu.be/r1LV77z_Ziw

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