I decided not to do it all 9-ply as that is just a little too thick for me. It's a bit thicker than worsted, by eyeballing it, which will probably grow after it's been washed.
Here is a better comparison. The 9-ply is wonderfully squishy though!
Started spinning the rest of it, going to stick with the 3-ply to finish it up.
When I start my next fiber I want to experiment with plying-on-the-fly to see what I can get. I think it might be possible to get a 5-ply by double looping, but I'll need to experiment. If I can get a 5-ply/6-ply that would be ideal.