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After a bit of time and investigation I think it was definitely just the first crawl not getting through all the pages. Thanks so much for all your help and extra suggestions

That does help, thanks! I bet the initial count was off because there were a ton of other errors or something like that. I'm just a little paranoid because my site was hacked last year and the spam links were hidden from view, I couldn't even see them in the source code. Google Webmaster Tools caught the hack, though, and this time they say everything is OK.

Thanks for taking the time to respond! I'll check out the extension...didn't know about that either

Within one week, the site crawl shows my on-page links going from ~10 to ~100+

Does anyone know of a rational reason for this? Sucuri shows my site is clean, so I don't think it's a hack. 10 seems too low to begin with anyway. Any ideas?

Thanks