I added in post n.4 some TYP files for this topo map better readability, I got them from sorcieremonique forum.
You can test them and give feedback.
Spoiler: more info on sorcieremonique forum here (French lang.):
http://www.sorcieremonique.com/t18288-topo-france-v4-pro-et-typ#


Spoiler: Replace TYP file in img file
http://www.gmaptool.eu/en/content/replace-typ