Knowing algorithms and techniques is one thing, being fast is another. If you aren't fast enough to reach harder problem in a contest, most of your knowledge won't be used anyway. Your problem rating chart is what I imagine a 1500-1600 would have. I advise doing a lot virtual contests to improve your speed

in the next contest, submit only a wrong attempt on A and leave. Boom, you're no longer stuck on green Thank me later!