are your forks ok? The 8plate should make any differance in how its shifting. I have bopth of what your talking about and mine shifted fine, but i now went with a duneable over ride ad lockup.
With the Hinson 8 plate you cant really rely on the arrows to adjust the clutch. What I do is take the adjuster and turn it out far enough so the pressure plate sits on the fibers. start turning the screw in until you feel it hit the ball/rod, then turn it back out 1/4 turn ad tighten everything down. My arrows are no where near lined up after putting in the 8 plate