Hi and Welcome!
Bitsetting is mainly an issue with ancient DVD players. Most modern players don't have problems with recognising DVD+R (including DL). What matters, that is the quality of blank media. Slim drives are not that reliable in general, and when DL is used, the only media you can trust at the moment is Verbatim.
TSST drives do bitsetting to DVD-ROM automagically if either Nero or ImgBurn is used. Unfortunately, this feature is often removed with OEM firmware for manufacturers like HP, Dell or other brand computers.
@eric: Thanks for moving