Probably your custom value for title is overwritten by mappings for Title property. I'm not sure in which order happens the mapping crawled properties and content enrichment callout, but maybe it's worth to try.
To verify this idea - consider removing all mappings, reordering them or switching to "Include content from All ..."
Probably it's not the case with crawled property mappings, because according to my finding mapping actually occurs before enrichment.
You might want to lower Diagnostic Logging level to Verbose for Search\Common Processing and Serach\Content Processing options. Probably this could help to understand what happens. (don't forget to switch back to default values after debugging)
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