Instead of trying to re-insert the formfields as each record is generated, via the MailMergeAfterRecordMerge event, you'd do better to wait until the merge has completed then re-insert the formfields for all records in a single pass - all you need is a placeholder for that, as the article in the link indicates.

As for values being lost, what you're doing suggests the formfields are not required after the merge - only their results. In that case, you could leave the formfields in the mailmerge main document but use a macro to convert them to their results before executing the merge. Just don't re-save the mailmerge main document after running the macro.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]