If you're at 2C, light still moves forward at C
This pretty much sums up where you don't understand SR. If you're at 2C you are outrunning light IN ALL FRAMES.
I understand that just fine. The difference between you and me is that I actually understand WHAT THAT MEANS.
Answer this question before you pat yourself on the back for your superior understanding: in any given reference frame, how do you determine the velocity of an objective that is moving away from you?