I called them back.
I suspect this machine will never go right with these drivers for Mac.
Here is what I did, in case it might help you.
I got a program called VMWare, and I loaded Windows 8.1 pro on it running virtually on my Mac.
Since I use CC on my mac, and you can use it on two installs, I loaded the virtual windows 8.1 Pro with pscc 2014, and lightroom. But most importantly, I bought Qimage ultimate (which only runs on Windows) and I print exclusively out of Qimage now on my virtuak windows machine.
I edit everything on my Mac Pro Tower and print everything through Qimage.
That is one suggestion - one possibility.
I think Phil's idea would be best, if HP will do it. You could always complain that the machine is not performing after numerous service calls and you want it replaced.
I would suggest that you uninstall and reinstall the drivers, and see if that helps. Sometimes after a repair or several repairs, it can make a difference.
I will say that the features and interface through Widows Pro 8.1 are much improved and the GUI is superior to the Mac controls. HP Utility is excellent through Windows.
These are several suggestions offered in the spirit of sincerely attempting to help you.
Perhaps one of the suggestions might help.