The color you should be seeing in your RGB node should be indistinguishable from black or you should be using math nodes to lower down every color component of the RGB node. Separating the RGB components and reducing them through math nodes, then joining them again and connecting the result into the SSS radius socket.
I’ve made an example to show what I mean:
This is a model with no SSS.
The same model using my SSS radius values (R 0.03, G 0.005, and B 0.003):
And this is the same model using something similar to the values you are using there:
Do you see where the problem is now?
My RGB node VS yours:
