took some time but i finally have the bike together and fired it up to try. here's what happend to the clutch after doing this mod:


tried to see what caused this. here's how the hub sits below the cover:

and here's the inside of the cover:

there's a little nick on the lever. looks like this is where the outer plate and hub cover hand contact:

those who have done this mod before: did you do anything else to create more space between the lever/cover, and the hub?
the change i did is the one shown in my pictures above. that created enough space in the clutch itself for the additional plates. of course the entire hub is now also 1mm taller.
there's a thrust washer behind the basket, no. 13 here:

does this need to be replaced by one that's 1mm thinner?
did you guys do anything else, or not have this problem at all?