Can you tell us how much freeplay you have on the clutch lever and how much deflection on the chain ??
These tend to be quite critical for smooth gear changes on the Tiger. Having said that, my Tiger gearbox has always been "clunky" and "notchy".
Off hand I think it's 10mm of freeplay on the clutch, and the chain should have a total deflection on 40 - 50mm.