i had that above motor apart 3 times and checked all the shims, tolerance, everything, couldn't find any problems so i said 'eh... normal ZA wierdness' then all of a sudden it cracked that clutch the rest of the way and ate itself alive in a 15 mile ride home from work.
i can usually hear/feel the change when things wear and loosen up, engine braking/decel you'll get a little different sound as the gear mesh changes, means its time to open up and check your shims.
using the 10w40 motorcycle oil, my za's dont shudder like the way a lot of A35's tend to. not sure exactly what you guys mean by shudder. but yeah i do blip shifts most of the time.