Hi mrdavao and welcome to the forum.
That’s quite an old thread you’ve replied to but there’s some good advice there.
Modern DVD writers can’t burn at single speed though and in any case with modern media that’s unlikely to produce a better result.
Quality wise it’s generally regarded as best to burn at half the rated speed of the media and that’s what I’d recommend if quality is important.
As far as burning software goes ImgBurn is second to none and can also be integrated into DVDFab.
If you haven’t tried it yet I’d highly recommend it as it’s a lot more reliable than the default VSO burning engine supplied with DVDFab and DVDFab’s author advises using ImgBurn instead.