bjc-s9000 generates photos that are unusably dark and grainy

My Canon S9000 wide-format photo printer works fine with this paper in windows or TurboPrint.

With standard Gutenprint driver bjc-s9000, image is extremely dark and grainy. See attached scan versus original in linked album: http://imgur.com/a/QG866

I've tried changing the following driver settings with no significant difference noted in IQ:

  - Color Model RGB vs CYMK
  - Paper type photo vs glossy photo paper vs "photo paper plus glossy"
  - Ink type CYMK vs "Photo CcMmYK Color".

Other notes:
  - Gutenprint v5.2.11.
  - Unmodified PPD
  - `StpPPDLocation: "/usr/share/cups/model/gutenprint/5.2/C/ppd/stp-bjc-s9000.5.2.ppd"`

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: printer-driver-gutenprint 5.2.11-1
ProcVersionSignature: Ubuntu 4.4.0-43.63-generic 4.4.21
Uname: Linux 4.4.0-43-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Dec 1 16:56:10 2016
InstallationDate: Installed on 2015-12-13 (354 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: gutenprint
UpgradeStatus: No upgrade log present (probably fresh install)