Why Does Save As-PDF/A reduce file size when I don't want it to?

I scanned a 4-paged printed card with my Epson Perfection 4490 scanner in order to digitally archive it. Each page is about 5x7 inches, and I scanned at 100 percent. I scanned each page as an individual TIFF image file, at 600 samples per inch.
I brought each TIFF image file into Photoshop one at a time. I saved each TIFF as a JPEG, at Quality: 8, Baseline ("Standard").
Then, I brought the JPEG's into Adobe Acrobat Pro to create a 4-paged PDF. Initially, the file size of the saved 4-paged PDF was 5 MB. (Later, I determined the individual JPEG's add up to 5.2 MB.) When saving as PDF/A, the final format that I want to use, the file size was unexpectedly reduced from 5 MB to 2.5 MB.
What is the reason for the file size being reduced to 2.5 MB? I had already done the compression that I wanted in Photoshop. The PDF was not downsampled. I purposely did not use Optimizer.
I did a test. This time, in Photoshop, I compressed each TIFF to JPEG, at Quality: 5, Baseline ("Standard"), the Medium setting instead of the High setting. After bringing these JPEG's into Adobe Acrobat Pro, the saved 4-paged PDF was 2.8 MB in size, an expected smaller size. Saving as PDF/A produced a file of 2.6 MB in size, very close to the same size this time, possibly indicating it accepting the Medium quality level.
Apparently, saving as PDF/A reduces the quality level of JPEG's to Medium quality, when they are of higher quality to begin with. It seems to be designed to optimize even when I don't want it to.

Here's the Audit Space Usage for the original 5 MB file. It shows the images taking up the majority of the space, as expected:

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