I wouldn't trust those results- particularly the DVD+R counts are just too low.
Older versions of CD-Speed supported Pioneer PI/PIF scans, but the units and counts were funny. The support was discontinued at Pioneer's request.
LiteOn DVD-ROM drives can do scans (I used my LTD-163 for this prior to acquiring a burner) but the results will not be comparable to what burners show.
Why don't you use your Plextor for scanning? You can use Plextools Pro (limited edition)
or - better - Alex Noel's PxScan/PxView
Regarding the Plextor:
I wasn't sure whether it would be any better at scanning the Pioneer.
I always heard of Lite-On and Benq burners being used for scanning (I'll have to search for and read explanations as to why).
I neglected to post that one of my Plextor drives (the one on the PC I was using for the burns and tests) was acting up and not working properly despite hardly any use.
I ended up getting Pioneer 115.
I may try to fix that PX-716A using some techniques someone posted, but I don't want to spend too much time on it.
I'll run some tests when I get a chance on my other PC downstairs which houses my other 716A. I'll post the results for comparison purposes.