If you have a 1G, make sure your clutch pedal assembly has absolutely NO play. Check it. Tap the clutch pedal very slowly and you MUST see the same movement translated to the lever. If it doesn't move n-sync with the pedal, you have play. Any play no matter how miniscule makes a big difference in engagement/disengagement of the clutch. Actually, even if you don't have any play, it's still a good idea to pull the assembly out, and weld the lever to the shaft to avoid any future wear.
Secondly, if you are having disengagement issues with the clutch engaging/disengaging almost off the floor, SHIM the pivot ball FIRST. I use a head bolt washer on mine which is MORE than plenty. I have found that I can even use the stock SC just by doing this. I would also modify the MC pushrod (repolace it with a longer threaded bolt) to give you a wider range of adjustment.

Play with it till you are happy.