Brian,
Thank you for reposting your pens. My favorite is the Euro in red acrylic.
As to your first pen, I believe it is the Acrylic Acetate AA-03 blank, available at Beartoothwoods.
I just did a number of Acrylic Acetate pens using El Grande kits. When thin, most if not all of these blanks benefit from painting the tube and the drill hole in the blank. Using black for this would have given you a result more like what you have when the blank is first rounded. I would suggest that you consider using a paint close to the dominant color in the blank for best results in this family of blanks.
Again, thanks for stepping up and showing us your work.