Hi Mier.
I am also a forum newbie, one who happens to live about ten minutes walk from the District line. To me, when seen at night, the lights in S stock have a very soft shadow-free slightly yellowish look with no obvious dark corners. Looking at your photos I would agree that the lights could be turned down a shade or two. The headlights ( which are in reality vey bright) and the destination display look just about right to me.
Good luck with the layout.