I'm all stock still but looking at improving visibility of my brake light. I noted that your rear turning signals are on like running lights? My front turning signals are on as running lights and flash when switch the turning signal, but rear are only powered on when turning signal is switched on. Looking at photographs seems that even your turning signals brightness goes up when brake is applied, or is it just appearance on photographs? 5 led pointing back and 15 around is evidently better solution for projecting light. Couple of days ago i saw Brinks serviceman pickup truck with add on LED brake light mounted on the tail gate and even though it was sunny it was very, very bright and visible.
See post #13, I put a link to my thread about the rear blinkers I'm using.