Few questions please as not sure you really tried the various valid suggestions in this thread. Just to make sure.
Have you downgraded the RC to 1.6. Many users success with this.
Did the tablet went pixelated immediatly or after some time, ie after flying 5-10 min.
(if tablet get hot, it's CPU might step down resulting to insufficient power for GO app)
Have you tried to lower video bite rate as already suggested? Not found evidence you did (goal is to contain data volume of video stream for less tablet workload)
Have you disabled video caching option.
(to reduce tablet CPU load by disabling extra processing to cache locally live video)