Test paint on every wall, not just one

Paint colours change with the light, and every wall in a room gets different light (sample note).

Paint two coats of each tester on card about the size of a sheet of paper, then move the cards around the room for a few days. Look at them in the morning, at dusk and under your own lamps.

Pick the colour you like on the darkest wall. If it works there, it will work everywhere.