I had a look at the Q-School qualifiers, and how they did last season in my match average table. The lowest 5 are:
244th, Weber, 83.25
247th, Dudeney, 83.13
283rd, Brooks, 82.24
290th, Rodriguez, 82.04
293rd, Ritchie, 81.97
That's some turnaround by Bam-Bam!