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When I was trying to make a cloud in Blender, I began to notice a strange issue. When the cloud is rendered using Eevee in the viewport, it looks fine. But when I render it, it looks much more transparent than the cloud in the viewport, as well as seeming very unrealistic. The cloud is made with a procedural shader.
As you can see, the actual render is many times more transparent and also looks very "blocky" if you know what I mean.
You are correct volumetrics are a bit different in EEVEE. For some reason, emission strength is required to control the volume. As you can see, I upped the emission strength, then plugged the volume into the emission color, to make it constrained to the cloud. Have a try. You might need to play with the values a little to get it just right in your scene, but it's a start.
