I thought, and someone correct me if I'm wrong, that if you use a full quart, your gonna lose some through a breather somewhere as it's not really ment to hold a full quart.
Also, my service manual calls for 800ml if dry, but for a change only 700ml as they are sure you won't get it all out.
Just another perspective.
I use a full quart of the Spectro 80wt because I can't stand the rattle, I don't think I ever really get a full quart back. I've always assumed (a) some's coming out the breather tube somewhere and (b) my bike spends a fair amount of time on surfaces other than the wheels.
I'm pretty sure I don't have any known leaks, I just chalk it up to attrition. Now my zuki, still, after replacing all the seals, weeps from the shifter lever a bit.
-MD