The way I have been doing load development is to shoot a ladder. If I find what I perceive to be a node I then add and subtract a few grains on the high and low side of the node and shoot confirmations. For example if I thought I had a node at 55.4-55.7 I'll load 55.2, 55.4, 55.6, and 55.8 (or wider) and look for similar velocities and POI shift to find the edges of the node. I then select what is the center of it. I'm going to loose 30+ degrees before rifle season so I figured if I went to the high side of the node (guessing) all would remain well when it gets colder.
Either way I'll learn the hard way later this fall!
By the way I authored "How wide are your nodes"