Hey Ally - welcome to CDF!
Ignore Nero InfoTool, sometimes it misreports things. Try downloading the newest version of CD-DVD Speed (version 4.50), and see what firmware that says you have (it should say it after the drive name at the top of the window).
I'd say try Verbatim media, or at a push, Sony 8x media should do you just fine. Stay away from stuff like Memorex, they use too many manufacturers to make their discs
If you had BYS1, then flashed to BYS3, then I'd leave it at that. Depending on what CD-DVD Speed reports, you could try reflashing with BYS3 again.