I am just a student but I think I may be able to answer your question.
In France most homeopaths are pluralists. The pluralists will look at the red line symptoms and give you a selection of remedies at a lower potency which have a larger range of coverage and therefore would cover your symptoms. This is not classical homeopathy where one remedy is given at a time.
The CH9 is the same as 9ch.
You should be able to get higher potency but I think the pharmacy would have to order it since it is not common.
Hope this has been some help.
Jay