CaminoFacil also does luggage transfer. I've used them on both the Frances and the Portuguese - very reliable and they have a very user friendly website to arrange each day's transfer. https://caminofacil.net/en/
This site is run by Ivar at in Santiago de Compostela.
This site participates in the Amazon Affiliate program, designed to provide a means for Ivar to earn fees by linking to Amazon