A better choice is to use 10.9.1 FB, HDMI won't hang the system when you plug it in, but that only works well on OSX 10.9.3 and 10.9.2. Like you said, you lose QE/CI on 10.9.4 if you rollback FB. A workaround for now is go to display preference, under color, use sRGB profile or select one by one until you get one without artifacts.