Watching the first 4K blue-ray I have bought on my new Epson EH-TW7300 4K-enhanced projector played by my Sony 4K Blue-ray player the film was very dark, unwatchable if fact, and playing with the brightness setting turned up did not improve the picture at all. . Watched on my old plasma, thus not 4K, TV the brilliance was normal. 4K from Netflix plays normally through the projector. I suspect the HDMI cable is not HDMI 2 let alone 2a which the Blue-ray indicates is required. Would this be right? If so I have a lot of carpet and floor boards to uplift.