Use Performance factor to calculate Hours to Spread in Histogram

Hello,

I am trying to incorporate a productivity factor to my hours to finish the project to show an accurate spread of hours/resources needed in Histograms.  However i don't want to change my remaining to earn hours (for S-Curves).  Ideally i would like to use the ETC that is calculated using a PF factor, but I can't get the ETC hours to spread in a time distributed report.  Does anyone have any suggestions on how I can achieve this?

Thanks in advance.

K