So you have 155 test rounds loaded to shoot???
Holy cow man.
I would honestly shoot 3 of each at about 1% variation to start. So like every other charge weight.
And probably only 1 of each of those if your velocity is way below the norm.
Maybe try this. Tell us what cartridge, bullet weight, and powder, along with brass manufacturer and primer, amd I bet we could narrow you down to shooting 15-21 rounds to start your testing. 155 rounds for the first round of testing is insane.
If you want to see where a node is quickly, shoot 1 of each at 300-400+ yards, skipping every other charge weight for a ladder test.