I don’t see how chain length is going to solve your problem. That will pull the lower jockey wheel further forward but the upper one will stay in the same place. B screw is the only thing which moves both away from the cassette.
My method for chain length - which I think is shimano’s suggested method, is chain around the big ring and big cog, not through the derailleur and add 2 links.
Photos will maybe help
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