Thanks Chris - it was even later here, so I can now read your posts and interpret the images more thoroughly

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First, some terminology, which you will obviously know already, but here for completeness. A Source Template defines the overall structure of a source. A Source is more specific, and is a specific example using that template. Citations are the links between a Source and the specific Events that are cited to the source. RM and FH have slightly different definitions of Event, but that is not relevant here (in RM, everything is an Event, but FH splits Facts into Events and Attributes).
In RM, all sources are built on templates. In FH7, templates are optional, and the term "Generic Source" is used for sources with no template. Prior to version 7, all FH sources were generic, so many established users have stuck with that way of doing things.
GEDCOM does not support Source Templates, so apps have to use custom extensions to include the template information in the GEDCOM file. The RM GEDCOM export includes full details of your user-defined template, but only limited detail from standard ones. Although FH has its own custom extensions for source templates, they are different to the RM ones. When FH imports an RM GEDCOM file, it discards all the template information that it does not understand, and converts all sources to generic. Much of the detailed structure of individual sources is relegated to what FH calls "Undefined Fields", which are not displayed in the Records Window unless you expand the plus sign at the left hand edge of the display. The Template field is blank in your last attachment, as the templates have been discarded.
This mangling of sources creates a lot of entries in the import log, as you have seen. The "Importing RootsMagic Source Templates and recreating detailed citations" section in the KB describes use of a plugin that repairs most of this damage.
How do you fix the GEDCOM import? Simple answer, don't. Even the plugin can only do so much, and there do seem to be flaws in the detailed GEDCOM structure that have persisted into RM8.
Concentrate on the direct import, using the "Import from other family tree file" option. It doesn't matter whether you use the RM7 *.rmgc or RM8 *.rmtree option, so use whichever is your master copy. With this option, your source structure is intact. There are some minor differences, such as different criteria for defining the Bibliography field (FH does not permit citation level fields), and some minor interface details of templates, such as the detailed field descriptions, are omitted out of respect for RM IP.
There is no import log from this type of import, as there are no errors to report on.
The Records Window in FH displays only Sources, not Citations. The 'Links' column displays the number of Citations to that source. For example, your
Neth Birth Record - Friesland, Achtkarspelen source has 106 citations. Highlight that source, and select View > Citations to Source Record from the top menu to display each individual citation.
Once you are happy that FH has imported your data correctly, you can concentrate on any changes that may be necessary to optimise it in FH, such as adding back any missing template details, redefining bibliographies, and possibly converting the "lumped" sources that RM uses extensively to the "split" sources that are a better fit to FH architecture.
They can be later postings, but have a quick look at
Sources and Citations in Version 7 for New Users to get an overview of how FH handles templates, sources, and citations.