The knock retard doesn't surprise me. You stepped on the throttle in high gear at a relatively low speed. The fueling momentarily went lean, there was a lot of timing with the boost rising. I don't know what your setup is. What chip are you running? Injectors? turbo? Engine mods? A longer file would be nice to see how the fueling, timing, boost, and load are reacting. Hard to tell from a snap shot.