Thickened Epoxy Formulations

I have built many stitch and glue boats.  For all of those boats, I've thickened my epoxy for fillets with a 2:1 mix of cello-fill (or fumed silica) and wood flour.  The instructions for this Annapolis Wherry tell me to just use wood flour.  I tried this, and it looks awful-- like cellulite!  I'm about to mix up a batch of the other, and smear it over the top.  Am I doing something wrong?  Why does it look like this?

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