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Measuring with multiple tip angles

We are currently working on a cylindrical part which is fixtured with the center of the cylinder parallel to the X axis.

The length of the part is 27.45mm and verified by calipers.

We measure a plane on the edge of the cylinder with tip T1A90B-90 then we measure a plane on the other side of the cylinder with tip T1A90B90.

When reporting the distance from plane 1 to plane 2, it reports at 27.724.

When we measure this distance with T1A0B0, we get 27.488, much closer to nominal and what we are measuring with calipers.

I'm assuming we're missing something regarding the change in tip angles?

Can anyone point out what we're doing wrong? We need to be able to measure this feature, along with all the internal features, using these angles.

Thanks.
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