The screenshots from ImgBurn aren't relevant to your problem. They list only supported Read speeds.
The screenshots from Disk Copier reflect the same info as we started this conversation with - a generic range of speeds is offered until the drive is given a blank to read, and then a modified range is offered after the blank has been read. The new medium is allowing a much wider spread of write speeds, and in fact that's the complete range of speeds your drive is designed to use.
If that's not slow enough for you, you'll need to research the market to find a drive that can handle slower burn speeds. That could be quite a job, considering that the market has reacted to the Need For Speed for quite a few years now and neither the drive manufacturers nor the few surviving disc factories cater for slow disc burning.
May I ask, WHY do you want to burn slowly? With today's designs of drive and media you tend to get the best possible result somewhere around the middle of the available speed envelope. So there's no technical need to burn really slowly, and in fact you'll get a less reliable burn at the bottom end of the scale.
As for CD disc brands, in general I prefer TDK, Verbatim, or JVC-Taiyo Yuden when I can get 'em. As far as DVD types go, I prefer DVD+ for their versatility, because you can change their 'booktype' to DVDROM if you need. If a copier is getting choosey about source vs. destination, try copying your source to an ISO image first, then burn that to the destination.
Have I missed any questions?
Regards . . .