Yeah i just meant downshifting is the only time the tomos trans acts funny, it should never chatter or shudder on the upshift. Even with ATF they shouldn't shudder. I reline my clutches with friction material (haven't run the commercially available ones) and if anything they shift smoother.
Maybe someone else can chime in on the springs cant help ya there.
The only other thing it could be is that lots of a55's are way out of balance from the factory, the countershaft gear cluster and the clutch bell itself can be way out of wack. That can cause a shuddering feeling but its not the 'shudder' that most people describe from the sprag clip missing.