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There are some possible kinks that are effecting your problem.
1. It is possible, even likely, that your primary does not share both a geometric and optical center. On a parabola this size, it might be harder to determine than on a larger one.
2. Are you near the edge of run out on your adjustments? If so, torque could be effecting the shape enough to push it out of alignment. It may measure right but is the reflection diluted as a coma a little?
Many times adjustments are "iffy" near the terminal ends and don't move correctly as in the middle. Again at this diameter it can be more challenging than with a larger one.
Depending on materials there is also the temperature variable that can skew your setup.
Just some food for thought. Hopefully health food and not junk food.
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