I’ve just concluded a phase of 5/4/3/2/1 and like you mentioned my last set is about 95% of my max and I plan the other sets “by ear”. The 3/2/1 are the heavy sets… 5 and 4 are on the conservative side even if that means making a bigger jump from 4 to 3 than from 5 to 4.
It might look like this:
405 x 5
425 x 4
465 x 3
485 x 2
505 x 1
6/6/6/3/2/1 is similar in that the sets of 3/2/1 are the heavy sets, the sets of 6 are conservative. They would use around 70-75% depending on the lift.