It looks like you may have a winnable case. Vehicle Code 21453(A) would seem to be the wrong code section for your alleged violation. This code section states "A driver facing a steady circular red signal alone shall stop at a marked limit line, but if none, before entering the crosswalk on the near side of the intersection…" Based on your description of what happened, you entered the intersection on a green light but because of traffic, blocked the cross walk on the far side of the intersection, the proper code section would be 22526(a).

I say go for it.

Forget about the technical errors though, they're irrelevant.