Boy, are you WAY off base. Most of what you say here is the opposite of the facts.
1st, there's no reason to be re-encoding anything. There are tools that will edit and re-author without re-encoding. TMPGenc-Author is one. 2nd, most set-top DVD recorders can deliver equal or superior image quality, (given a good quality source image), than 90% of the capture cards available. Certainly better than any equally priced capture device.
Everything you say here about re-authoring DVD recordings on PC is equally true about re-authoring video from a capture card, all the same tools would be used. So there's no difference in the process be it recorded video or captured.
That said, none of this has anything to do with the posted issue.
I'd suggest using -RW discs, as that's the format that the Pannys have been using the longest. I've never had any unusual issues with them in my ES10. But I'd recommend using RAM discs anyway, as they seem to be pretty reliable. Although you do need to take certain steps differently with DVD-VR formatted video, and not all software will play nice with it.