The dark picture on the 811 SD outputs cannot be fixed in software, it is a hardware problem. It will be tweaked in the next release but not fixed. Thats one of the reasons it is taking so long to get that release out. Remember it was supposed to be fixed in 255.
I will not state how I know this so you can jump on me for rumor mongering if you want, but we will see what happens. What will be interesting is to see is if dish fixes the hardware and/or offers to replace units.