Pushing down the rule of heading

Writing a book of probability in arabic, and using the titleps package for the headpage, I obtain some non-beautiful result when there is in the headings some "long-down" letters like the arabic letter ع , for example, where the rule touch some letters. So I want to push down the rule of heading with 1pt or 2, to obtain a best heading. How I can I do this? I give an example to watch you the effect..

I use titleps and this is my page style..

\newpagestyle{Mybookstyle}{
  \setheadrule{.1pt}% Header rule
  \sethead
  [\thepage\hspace*{14pt}\thetitle]% even left
    []% even centre
    [\sectiontitle \hspace*{5pt} .\thesection]% even right
{الباب          
    \arabic{chapter}. 
    \chaptertitle}% odd left
    {}% odd centre
    {\thepage}% odd right
}