You can try reblocking it with a sequence of fill level percentages:
    hammer reblock <fs> 10
    hammer reblock <fs> 20
    hammer reblock <fs> 30
    hammer reblock <fs> 40
    hammer reblock <fs> 50
    hammer reblock <fs> 60
    hammer reblock <fs> 70
    hammer reblock <fs> 80
    hammer reblock <fs> 90
    Each PFS needs to be independently reblocked.
					-Matt