We set up your 3880 printer with Piezography here, so I know all carts/inks were in the correct order when you left with the original Carbon ink set, but also know you ordered the Special Edition ink set after printing with it during your recent workshop.
By "solarized", do you mean light areas are printing dark and/or darks are printing light (which would be obvious looking straight at the print, not at an angle), or do you mean "bronzing", which is colorful light being reflected back, and is noticeable at an angle, but should be eliminated by printing GO.
Are you evaluating prints with just ink on paper (without GO), or after printing the GO layer?
What inks are currently installed in your printer?
Have you printed a nozzle check to make sure all channels are fully printing, and in the correct order?
Please let me know, thanks~ Dana