Not confirmed yet... 8520 may be subwave4, with one more subwave5 up. If this is subwave5, we will see a top higher than 8678.
If we drop below 8520, then we are in Wave 1 down as follows:
Subwave 1: 8678 down to 8520
Subwave 2: 8520 up to ??? (Something below 8678. Maybe 8623 (0.65) or 8644 (0.786)
Subwave 3: blasting down past 8520.