The first scan is quite bad. PIE's are slightly out of spec (max 280), and the jitter is WAY out of spec (max ~9% - although most media exceeds this limit). I'd say many pickier drives would have a very hard time reading both those discs, because 15% jitter is pretty much unheard of.
Second scan is okay, OK PIF's and OK PIEs. Jitter is horrid though. I suspect it might be that your Plextor doesn't like them, because that media is usually very good, although I admittedly know very little about Plextor drives.