A much simpler solution may be to use a component/digital audio balun to send the video and audio to your second TV via cat 5. HDMI is tough to split because of all the content protection that is built in. I share sources like what you are trying to do what I do is use component instead of HDMI for my bedroom.
The balun's I am using have inputs for component video and coax digital audio. I already have a cat 5 connection going to the bedroom from my AV rack. I use Muxlab 500050 but there are many models. Versions that are wall plates are also available.
Remember that for everything but a few pay-per-view movies that the best video quality is 1080i so you are not loosing anything going this route over HDMI.