Holy moly! What an outstanding stack
Rui_Santos! That's actually already a
shot but may I may give you a tip for Helicon Focus? Render the stack with method B and method C and save each output individually. Open Helicon twice and import both imports to render it again. This will reduce the visible halos to a minimum. Unwanted parts with too strong contrasts or other artefact from method C can be retouched with the retouching tool.
Hope this will help you to improve your stack quality even more.
Have fun,
Jörg