Well, this is going back and forth.....
I had just copied " The injection timing, determined by the wellling up method " to ask where you got that from.... then yall seem to be going to the drip method...now you are back to " noone seems to be praising the drip method"...

I only know of two methods shown in my set of Factory Shop Manuals concerning setting the IP for my 1980 240d... low pressure ( drip ) and high pressure ( requiring equipment I don't have )....

This ' welling up ' deal is a mystery to me. Where did you read about it ?