Peter, I think most of what you ask can be found in the paper neg threads, but there is one issue that I don't think has been discussed recently, namely whether the RC papers that have a developer incorporated are appropriate for pinhole. I think you wouldn't have much control over contrast during development if dev is incorporated, using dilute dev or snatching probably won't help much. Maybe if you can get a soft grade or multigrade RC paper like the Forte RC without developer incorporated, that'd be a good choice. But honestly I don't know anything about most of the RC papers and dev incorporation, so I hope someone else can chime in with some info.