If I'm not mistaken, 1200 pixels would be the highest vertical resolution at which you could have pixel perfection using the lowest value (0.64) of the in-game slider.
Your max vertical of 1440 would want a UI Scale of ~0.53 for pixel perfection, but I'm not sure if the game client accepts if you manually set a value beloe 0.64...worth a shot maybe.
You could always play at 2560x1200 for a cool cinema vibe.
