I am writing a scholarship essay and one of my sentences is:

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> "Although both of my parents have bachelor’s degrees now, they were not **as** well educated or stably employed when I was growing up."
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When I asked someone to read it over, they suggested that I use *so* instead of *as*. I looked it up, and I found that generally negative comparisons use *so*, so it would be correct in this context. Since both *so* and *as* could work, which is more grammatically correct?