Can you post a picture of your targets? Bullet and BC used?
Ultimately, you're going to keep chasing your tail until you shoot a statistically significant amount of shots in each group.
Take the attached for another example of why you need to shoot more rounds in each group. If I ONLY used shots 1 & 2 (6 & 7) I'd say, "wow, I need to adjust my zero U1.25 MOA". In reality, those shots are towards the perimeter of the cone of fire and I only need to adjust U0.25 MOA. I'd be chasing that zero continuously and wondering why my ballistic solutions at further distances "aren't correct".
We don't know if your shots are in the center of the cone of fire or on the perimeter. Would also help to stop using linear units to describe angular measurements.
The limited data you have suggests a drop of 3.5 MOA between 100 and 200 yards. If your 100 yard shots are on the upper perimeter of the cone of fire and your 200 yard shots on the lower perimeter, the actual drop could only be 2.00 MOA, 1.75 MOA, 2.25 MOA, etc., which could be a correct ballistic solution.