I have heard the square taper interface likened to "a landing craft going up on a beach"

where the tapers match and the running torque goes up, that's enough

come back and re-visit after 50 miles

on Campagnolo cranks in good condition that turns out to be about 220 in/lb

the Stronglights are so soft it is hard to tell but I'd start wth 150 in/lb and again re-torque after 50 miles.

should be clean. To grease or not to grease is up to you

great pics from Chas on the details of the spindle to arm interface

/markp