(first-off: Digesters, I'm sorry 'bout the html" but we beat that way down...)
The question at hand: Do the 950 and 21/2200 use the same ink?
If not and the 950 is Dye Based, move on the the section below:
The 21/2200 is stated to have a 4 pico dot, but with the OEM pigmented ink, outputs the equivalent dot size of a dye based 2 pico. So then, in theory, if the 950 is an acual 2 pico head, and some one were to be able to grind a pigment small enough to get through w/a minimal chance of clog, then might we not expect to see the output of approximately a 1 pico dot?
Thinking smaller all the time... (no insults please!)