I’ve found that raising the nocking point to lower the POI only works if you’re shooting instinctively. The higher nocking point causes the nock end of the arrow to be higher than it was before, which means that the arrow ought to impact lower if you keep your bow hand in the same place, which you probably will if you’re shooting instinctively. However, if you’re using gap, you will see that the point of the arrow is lower than it “should” be, and will raise it up to whatever your gap was, thereby negating the effect of raising the nock point (other than screwing up your tune, as you said, which might lower your POI slightly, but that’s not the way you want to do it).
I just tried your method. I’m finding it more difficult to see the strike plate than the arrow point, but like you, I sure would like to have a reference I could just use point on, and have the same problems as you do with the fixed crawl. Maybe as you say, it will come with practice.