Both the Bulqpac and Mirror brands are notoriously bad media and should be avoided, simply because they will probably fail. Sounds like the printing surface is not much better. You can try using different print settings, but frankly why bother if the disc will fail anyway?
They are probably Ritek made discs, but could be anything and could also change frequently. Really, if you can't get Verbatim DL discs, don't burn DL discs. The alternatives are pretty bad.
What these 3rd-tier media sellers like Bulqpac and Mirror do is buy the cheapest discs they can find, often factory rejects and often faked media. The printing surface could be added by anyone, or it could be from the factory, you never know. The only thing you can be certain of is that they will fail at some point.
Consult the media forum and bargains forum for online sellers of good media in your country. Verbatim makes a range of printable discs that should be available most anywhere and are probably the safest bet.