Code:
p54 factor: 115937219551971052177979966083323924336819776341443587
p56 factor: 60782557590530142003676921569957900375224929291902211769
p87 factor: 326316275874858407717873129053603923198897169129398847757844636829262855475283564104097
110M unique relations built a 4.5M matrix using TD=128.
Solve time about 14 hours. (-t 3).
Log at:
https://pastebin.com/7fy2NX3Y