Playing with HD can definitely help, though I would recommend looking anywhere in the middle/middle-right instead of the right of the screen unless you're able to see the notes and remember the sequence while simultaneously analyzing the next set of notes. If you want, you could even play with HR or even HDHR; any combination for more than 2-4 plays (in my experience) can lead to noticeable improvement, especially if you proceed to play a harder map as NoMod.
However this is just my experience with playing with HD, HR, and some DT, of which I don't have much. As cliche as it is to say, you just have to experiment for what works best for you as an individual.