Some very good analysis here. My short-term and medium-term analysis is very close to your wave count here. You have done well to spot the ending diagonal pattern. I saw it some time ago but surprisingly you are the only other analyst I have seen who has also seen this pattern. It is possible that your blue (a) wave was in fact a truncated/failed red wave 5 and that the price will now move up from here, but like you I am looking at 1595 and 1565 as possible downside targets.