Don't assume that problems like the wiring issue are particular to Keystone. You'll find issues like this across all manufacturers. Just get it fixed and move on. That's really the point of the shake-down run anyway - to find as many of these things as you can and get them fixed while the warranty is still open
I really feel bad that you must consider an upgrade to the TV, but we really struggled with this too. You'll feel better after it's all done. Real safety is worth a lot.