Sometimes when I'm doing multiple sets at the working weight, I find that the second set is a little smoother than the first, making me think that I could have done just a little more on the way up.
OTOH, set 3 4 and 5 are perhaps possible because you did not tire out as much
IT is a balance
Every 10kg up to 120kg is crazy, I agree.
Low weight warm up is to groove the move, make sure if your an old man you dont have a kink/pull/tightness you were not feeling earlier, etc. Then after getting in 10-20 super low weight reps, maybe jump to 1/3 between where you are and your working sets and do 5-10. At that point, Im probably doing 1 or 2 more sets between that weight adn the final working sets, where my subsequent jumps are smaller, and the number of reps decreases. Much like the good Doc says
To some extent more reps at a weight allows for bigger jumps, but that has limits for sure.
Deadlift worknig set of 309
BW Squats, maybe 10
Hang High Pull Empty Bar to 144 22/11 lb increments, 5 to 3 reps (just saying, you dont have to do the exact exercise)
Jump to 188 do a set of 10 RDLs
1 x 8 @ 234 - My first actual full deadlift. All that bending down could wear me out
1 x 2 @ 267
1 x 1 @ 289
3 x 3 @ 309
That whoe Hang High Pull thing really has not much to do with your question.
Working Set 204
Empty Bar for 10
89 for 10
122 for 6
155 for 5
177 for 4
192 for 2
give or take.
Sometimes its a matter of which plates are easiest to switch out
Use your performance on the working sets to gauge the warm up value
just one amatuers opinion