I had the same problem with distributing HD signal. I solved it with a HDMI splitter and a HDMI/IR-Ethernet-Tranceiver. So, the HDMI signal is splitted after the setop box. One HDMI cable goes to the BV10 in the main room. The other one goes to the HDMI/IR-Ethernet-Tranceiver. From this tranceiver, two CAT6 cables go to the second room where another tranceiver converts the signal back to the HDMI and then to the BV8.
This transceiver is able to send back the IR commands. So, I`m able to control the settop box from both rooms. There is a distance of about 30m between the TVs, but it is still possible to see HD.
There is only the limit, that I only distribute the signal of the settop box. The bluray is not included in this setup. Another problem is, you have to define, which TV controls ON/OFF of the settop box. If both can control the box and you would switch off one TV, then the box would switch off, even though the other TV is ON. I solved it in that way, that in the second room, you have to swich on/off the box manually with GO 0.
Here the product I`m using: