yes look at the tv codec specs isn't it limited at 60Mb/s, irrespective of media location (like i said for sony https://en.wikipedia.org/wiki/High_Efficiency_Video_Coding_tiers_and_levels) 4k discs raw can be ~ 100-128Mb/swhich of course is more than the TV can handle, which I guess is the issue!
12ft&wall probably won't cut it .. anyway - 4-5ft was what the sony AC benchmarks had used.