The slaves files should also be updated to specify the data path in the slave header.
Amiberry 3.3+redquark uses the whdload_db.xml file which scans Retroplays WHDLoad packages and would put the data path if it finds it in the slave headers - as per
https://github.com/HoraceAndTheSpide...ry-XML-Builder
However, at the moment it does not process the datapath value in the XML. I have raised a Github ticket regarding this on the RGL Github project for Amiberry 3.3+redquark.