The method in the link you posted requires that the #1 delivery valve be removed. I think you should return the injection pump timing to the original marked position and forget about that approach. Injection pump timing needs only be checked when the injection pump is removed / installed, and then once again after a few thousand miles to make sure it hasn't moved. After that it typically never needs to be adjusted again in the life of the car.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC