I agree with a 5.56 you have to sweep in fine increments to plot the nodes, but for the rifles I shoot, I think you slipped a digit on the node spacing?
For Service Rifle and for examples like a varmint profile (Sendero) those nodes space out more like 30 to 40 mils with bullets like the SMK 77 or SMK 80.
Your node sweep needs to be on the order of 0.005 to 0.007" to find them or to have at least a plot that you can interpret without guessing, then you can go back and refine it some more.
It is a coincidence that popular calibers derived from the 6 BR like the 6 Dasher, 6 BRA, 6 XC, etc, use the Berger 105 Hybrid which features a tangent-secant ogive and that bullet also likes to have nodes spaced out about 30 to 40 mils apart.
You have to have a good balance between the quality of the components like the BBL, the bullets, the whole gun system, and the shooter, to be able to have clear readable results.
If any part (or parts) of that eco-system has a parameter that is out of control and creating a strong scatter in the group size, it will make tuning the load for charge or seating depth very muddy. YMMV
ETA: I am discussing the general performance of Highpower, F-Class. PRS, etc., not Bench Rest where seating depth can be a completely different affair.