OK, I don't use Apple software for anything but the operating system itself. All the rest of it is crap. If you want industrial-strength screen-grabbing and screen grab editing capability go to the Techsmith website and download Snagit for Mac. You'll never look back.
I'm attaching a sequential screen grab for the whole process of getting to ABW using Snagit. My version of the Epson driver is for the SC-P5000 printer. The P800 may not be identical but they are bound to be close. Please follow from left to right:
(1) Set Printer Manages Color in the Lightroom print module bottom right in the Print Job Panel.
(2) Go the Epson Drive by clicking on Print Settings at the lower left of the Lightroom interface.
(3) Select the Color Matching menu.
(4) When it opens, select EPSON Color Controls (this disables ICC profiles).
(5) Then go the Printer Settings menu , in the Basic tab look down to Print Mode, open it and select Advanced B&W Photo.
(6) Then click on the Advanced Color Settings tab to get the tools for controlling the character of the ABW one wants.
It's a long way to Tipperary, but that's it.