What you are seeing is the #1 IP plunger closing the fill port of the injector barrel....the drips are indication of the very threshhold of beginning of pressurization in the fuel element .....The drips are an indication that the fill port is almost completely sealed by the upward travel of the plunger...As the fill port is blocked by the upward moving plunger...no more drips...
In actual operation the only escape for the now pressurized tiny column of fuel is out of the IP fuel line to the injector...
One forum member uses a bucket suspended above the engine full of diesel to maintain a constant pressure to the IP fuel chamber to get the drip count the same every time.....that is how I am going to do it from now on...
Hand pumping is too variable for a constant pressure....
If you have studied this stuff like it looks like you have...you are going to be extremely close to what spec calls for....once you do it it will make more sense....

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)