  The GEp-III and GEp-2$\gamma$ experiments, carried out in Jefferson Lab's
Hall C from 2007-2008, consisted of measurements of polarization transfer in
elastic electron-proton scattering at momentum transfers of $Q^2 = 2.5, 5.2,
6.8,$ and $8.54$ GeV$^2$. These measurements were carried out to improve
knowledge of the proton electromagnetic form factor ratio $R = \mu_p
G_E^p/G_M^p$ at large values of $Q^2$ and to search for effects beyond the Born
approximation in polarization transfer observables at $Q^2 = 2.5$ GeV$^2$. The
final results of both experiments were reported in a recent archival
publication. A full reanalysis of the data from both experiments was carried
out in order to reduce the systematic and, for the GEp-2$\gamma$ experiment,
statistical uncertainties. This technical note provides additional details of
the final analysis omitted from the main publication, including the final
evaluation of the systematic uncertainties.
