First off, the following answers are UNHELPFUL:
1. LOL just get a monitor, you're never gonna get the same performance on a TV.
--I don't need monitor quality input lag. I just need not unbelievably awful input lag.
2. LOL, turn game mode on.
--That was literally the first thing I did.
I was using a Hisense Tv as a monitor until Saturday. Then it died. On it, I was getting 33ms. I bought a Samsung 40" Ku6300 as a replacement. That should get less input lag than my old Hisense except at 4K @ 4:4:4 (
Today I bought a Vizio D-series 40". This should have the least lag of any TV on the market (http://ca.rtings.com/tv/tests/inputs/input-lag). I'm still getting 100 ms of lag. I've used two different laptops to calculate the lag. And I've used two different HDMI cords.
Please help, I'm really frustrated.