I tinted the windshield and front windows to 70% and everything else, including the area on top of the FWDs, to 30%. It made a world of difference with the heat.
I did learn to be sure to take it to a place that has experience tinting the front windshield on the X AND can do it as one piece. I went to a shop that had never tinted an X windshield and they did the first attempt in two pieces. It looked normal from the outside but horrendous from the inside. The second attempt they did one piece but it had some obvious imperfections. They said I could keep it as is for free or they could remove it. I just left it as is.