For most exercises I start with smaller weight set and then increase it. Like 8rep 40kg, 3x8rep 45kg.
For pull-ups for, i do not know what reason, I selected opposite approach 9,8,7,6.
Should I better change it to something like 6 (warm up) and then do working sets of 9, 8, 7 pull ups?
I see. Question: it is unlikely to jump from 7,7,7 to 8,8,8 directly. What would you do in transition 8,7,7 or 7,7,8?
Increase the first set first and do 8 reps for as many sets as you can after that until you can do all of them. Then you start over with 9 reps.
got you. thanks