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..