I've taken two more assessments, which seem to be the last ones, at least for a while:
Sweep Seeker: Essentially "High or Low?" with visual sweeps. My starting level was 43 ms, with a set goal of 37 assessments. This corresponds to seeing a professionally-served tennis ball 1.1 feet sooner. This one was also much harder than the other ones I've done.
Sound Replay: Essentially the same as "Tell us Apart" but with sequences of phonemes. After 15 minutes, I could repeat sequences of four phonemes.