kg_evilboy You are the MASTER. Thank You
It seems that quality scans done at 8x do not show errors at the end. So the problem probably is not with the quality of burning but with the ability to read at 16x by both Pioneer 216 and Sony 7280s.
They seem to have problems with reading final fragments of the DVD discs.
I am a little surprised that a new burner shows so many errors at quality scans done at 16x.
Is it typical?
I will be investigating this further.