I feel for you TS.
I have allso burned over 2000 dvds since I got a burner and discs, back in the day. I am moving over to BD-R soon, and have allways used pioneer burners (and at slow speeds). Been using verbatim and maxell from the start. I have now read back over 500 dics and I got no errors at all. Amazing as these discs are now old. And they still work. I started on 4x pioneer dvd burner. So I say the discs are 10 years or more.
Anyway the DVD standard, discs and so on can handle more in terms bad plants pushing out bad media and it would still work. I allways trusted verbatim and maxell for dvd media. With BD-R not so much and I allso turned to this forum for help.
The problem is that most places that sell BD-media don't give you they TRUE place (or company) that made them, they just go on the name of the box. Whatever that is. So you don't know what you are getting when you buy media. Now verbatim might not be bad and so on, but the problem is a lot of BD-media is way to expencive.
From what I can tell (information on this forum) and reading up on bluray is that the only TRUE media you can trust, is panasonic and falcon. They don't outsorce their NAME onto other cheap brands or discs so they can't use the name whan pushing out cheap media. Maxell and TDK don't make any discs any more (not BD anyway) so that brand can be anything in the box.
Panasonic is not to hard to get hold of compared to falcon, and price is not to bad, better quality and cheaper price than verbatim. At least panasonic give you high quality and you can trust it's true. There might be places in AU that has them for a great price. Otherwise I would get the media off e-bay from japan. You will get a better price if you buy like 25 or 50pcs cakeboxes. Cheaper per disc.