Define Horizontal by Best Fit tool [GEOPAK SS4]

How can I get the tool to result in a line not an arc?  Using the Make Single Element mode, even if the line string is a roughly straight line, the result is always a curve.  The radius of the fitted arc is sometimes incredibly large, like 325,067 feet for example, so it looks like a straight line.  I would like to just get a linear regression like in Geopak Cogo Best Fit Tool. 

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