...you didn't lock up the front, and yet you went down during hard braking as you came upon a paint line? Somehow I find this hard to believe
The best thing to do after an accident is learn from it. Analyze what you did wrong, and learn from it. In this case, you did 2 things wrong. You were indecisive about the light, and you let your SR of grabbing brake take over during panic braking.
Do 2 things: 1) be more aware of your surroundings so you know your options immediately when you come to a light. This will significantly speed up your decision making process if the light changes. 2) Practice panic stops from 30mph in a deserted parking lot or neighborhood until it becomes muscle memory and you can feel right where the front wheel just starts to slip a bit but does not lock. If you can learn to feel that threshold, you will be able to brake on any surface.