I've used 531 for a good portion of my training over the past 5 years in a fairly simple format, but I've always used 90% of my gym max for my TM. Typically iit was a top single ,double or triple and I applied the described formula.
My second exercise/movement was either done as SST ( my favorite) BBB ( which was too much) or 5sPRO. I would just make rough guess on what a top 5RM would be when done after the main movement and reduce by about 10%-15%.
I am looking for some help on how to determine my TM when using 5 progression for the main exercise ,squat,bench,DL, press.
I own the original 531, 2nd edition , 531 for PL and beyond. The last book is the only book that describes 5s progression ,but in my reading not in this manner.
Thank you in advance, it seems there are many very knowledgeable people who will share advice and experience on this forum.