I never looked at the excel sheet. Iwas just comparing the output of the solve block with your program in tghe second Mathcad sheet. It seemed to me the differences were significant and more than just 1 or 2 degree. Maybe I was wrong. After all I didn't see that the constraint in the solve block and the objective function in your program are the same, but I didn't spend much time on the comparison and concentrated to get the solve block running which it should be now. And anyway, if you are happy, we shouldn't worry ;-)
And yes, I would also guess that the Levenberg-Marquardt algorithm, which is usually used for Find(), sure is more sophistcated and accurate than an algorithm which just adds a small amount until a calculated value is within a given tolerance.