Keep the offset, but reduce the title height by 2 pixels

themes/default/themerc

themes/default/title-1-active.xpm

themes/default/title-1-inactive.xpm

themes/default/title-2-active.xpm

themes/default/title-2-inactive.xpm

themes/default/title-3-active.xpm

themes/default/title-3-inactive.xpm

themes/default/title-4-active.xpm

themes/default/title-4-inactive.xpm

themes/default/title-5-active.xpm

themes/default/title-5-inactive.xpm

themes/default/top-left-active.xpm

themes/default/top-left-inactive.xpm

themes/default/top-right-active.xpm

themes/default/top-right-inactive.xpm