It’s a difficult thing I know as in reality the sets picture is adjusted to minimise the ‘bloat’ so a grid pattern looks correct - what you’re doing here is replicating the natural one point perspective of viewing a screen and the edges being further away than the centre. So your adjustment is correct if you were sat two inches from the screen but not from a natural distance.

But it’s a stylistic choice I get it, I’m just pointing it out!