I'm not sure if this what you guys are doing but I don't turn HDR on the tv itself I recommend only turning it on on the game your playing. Turn HDR on on the ps4 settings and within MLB THE SHOW Video settings and try to use game mode and adjust your settings off that I wouldn't turn on HDR within the tv.
Now if you have your tv in standard, sports etc the colors will pop and be bright then when u go to game mode changes need to be made then same thing when u go into game options and enable HDR there usually for me back light to max fixes the issue.
Hope this helps.
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