El Gato27 I am not yet there myself. Your latest small-small shows the chain is no longer dragging on the top Jockey Wheel. Your latest big-big suggests you still have some leeway to go shorter but..

Dérailleurs suffer from 'degrees of freedom'. Reducing the length of the chain will wind up the dérailleurs springs and pull the top jockey wheel closer to the big cog. Then you adjust the B thing.

Looks like you are already on the case.