100% agree with Vilas. When flying with A/Thr off, you don't really have to look at the engine parameters. You set it around 50% n1 for the approach then just by looking at what the speed trend is doing you can adjust the power accordingly. Speed trend is so good you don't need to look at the n1 setting to fly accurately. I only have a quick look sometimes just to do fine tuning to match the N1 setting equally on both engines.