I am trying to get those cotton candy puffy clouds look out of these in the daytime condition and to no avail. I've been able to achieve the look with volume mat and geo but not with a corona volume grid.
Can you post what you are getting with volume mat and geometry and what you are getting with the grids?
Maybe you should try enabling/disabling the channel color mapping for absorption, or try adjusting its curve. You can use it to, for example:
- create something that has a hard layer on its surface and becomes more transparent inside
- create something that has a soft outline, and becomes more dense in the inside