Resolving true ground elevation

What do you think is the best way to achieve relative ground elevations while using Reachview alone? I have been testing by averaging the base, shooting a couple of benchmarks and adjusting the points to those benchmarks, but I am pretty sure that isn’t the best way. I am noticing that even though the GEOID offsets are normally consistent across our size of projects within a couple of hundredths of a foot that the relativity of the points is not correct when an orthometric height is compared against a ground-leveled elevation.

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