  The soft wall model in holographic QCD has Regge trajectories but wrong
operator product expansion (OPE) for the two-point vectorial QCD Green
function. We modify the dilaton potential to comply OPE. We study also the
axial two-point function using the same modified dilaton field and an
additional scalar field to address chiral symmetry breaking. OPE is recovered
adding a boundary term and low energy chiral parameters, $F_\pi$ and $L_{10}$,
are well described analytically by the model in terms of Regge spacing and QCD
condensates. The model nicely supports and extends previous theoretical
analyses advocating Digamma function to study QCD two-point functions in
different momentum regions.
