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I see you use Foxit and the "reference management" programme Mendeley Desktop.
I have recently started using another reference management programme called Qiqqa, having tried Zotero and Mendelay - I found the latter two did not meet my requirements.
I was blown away by Qiqqa though - it scans and indexes text-searchable PDF files and PDF files containing images
- i.e., it OCRs any text in the images in the PDF files. I let Qiqqa loose on my library of about 650 PDF documents, and left it scanning and indexing the lot overnight.
It successfully OCRed and indexed all the imaged PDF files too. It seems quite intuitive to use and has lots of good features.
There's a good list and comparison of "reference management software" here: Comparison of reference management software
On the Qiqqa website, there is a good comparison between Qiqqa, EndNote, Zotero, and Mendelay, : Qiqqa Features
The OCR capability stands out as a strength for Qiqqa.