  In this investigation we present a detailed study of $\partial F_2/\partial
\ln Q^2$ which is supported by a coupled analysis of $J/\Psi$ photo and DIS
production. Both channels are directly proportional to $xG(x,Q^2)$, and as such
serve as excellent discriminators between different approaches and models.
  We then show that taking GRV98NLO as input and correcting it for SC, we can
reproduce the recent HERA data well. The calculation depends on one parameter
$R^2=8.5GeV^{-2}$ which is directly determined from the $J/\Psi$
photoproduction forward differential slope. With this input we obtain an
excellent fit to the $J/\Psi$ photo and DIS production data. Our calculations
made in the LLA of pQCD take into account the corrections implied by the real
part of the production amplitude, off diagonal (skewed) gluon distributions and
the Fermi motion of the charm quarks within the bound Charmonium system.
