I believe you are using a Tika sporter 6.5x55 to learn to reload for long-range shooting. Good idea, it' a good choice, and can be rebarrelled later to a heavy-weight barrel.
The strings you showed us are excellent, but you will run into information-overload with such a small increment in that size case.
You have the ES for each load, so you will see a strong overlap at each step. There is too much overlap at each load...It MAY overlap to maybe the second increment.
I understand that the unmarked loads are 5-shot? The rest are 3-shot?
I believe you to say that you seated the bullets to a .030" jump? That does sound like a bit for VLDs. I would set them a LITTLE closer.
You are measuring the groups center-to-center of the two widest in each group? Sounds good. You shouldn't have any trouble finding the centers.
I don't know any other way. I've heard others discuss different ways, but I usually reject them. If you prefer one way over another...and are consistent, I see no prob.
Have fun,
Gene