  By looking at the parity-nonconserving (PNC) asymmetries at different
energies in $\vec{p} p$ scattering, it is in principle possible to determine
the PNC $\rho NN$ and $\omega NN$ couplings of a single-meson-exchange model of
the PNC $NN$ force. The analysis of the experimental data at 13.6, 45 and 221
MeV simultaneously has been performed by Carlson \textit{et al.}, who concluded
to an agreement with the original DDH estimates for the PNC meson-nucleon
couplings. In this work, it is shown first that the comparison with updated
hadronic predictions of these couplings rather suggests the existence of some
discrepancy for the PNC $\omega NN$ coupling. The effect of variations on the
strong coupling constants and introduction of cutoffs in the one-boson-exchange
weak potential is then investigated. As expected, it turns out that the
resulting asymmetry is quite sensitive to these parameters regardless of the
energy. However the above discrepancy persists. The dependence of this
conclusion on various ingredients entering an improved description of the PNC
$NN$ force is also examined. These include the two-pion resonance nature of the
rho meson and some momentum dependence of the isoscalar PNC $\rho NN$ vertex.
It is found that none of these corrections is able to remove or even alleviate
the above discrepancy. Their impacts on the theoretical determination of the
vector meson-nucleon couplings, the description of the PNC force in terms of
single-meson exchanges, or the interpretation of measurements, are finally
examined.
