There's a bug in "Don't include in report refresh" like described here: http://community.powerbi.com/t5/Desktop/Disabling-quot-Include-in-Report-Refresh-quot-works/m-p/1017...
unfortunately I didn't test correctly and this thread is closed, but the bug is still there and preventing solutions for problems like this:
If the query that shall not be refreshed is not referenced by any other query or part of a UNION-operation in DAX, then everything works fine, but if it is referenced as mentioned, then it will be loaded again.
A lot of the usecases for this features are of this kind, so this bugfix is really needed !!!