how are you bleeding it? the best way is to have everything empty and bleed from the bottom forcing fluid from the bottom to top pushing out all air bubbles. i have done tons like this on transport trucks and it is the only way to get it perfect. i have seen guys bleed a clutch for hours trying to get it right
Another method I used for years when the standard hold-the-pedal-down-open-the-bleeder method epic failed was to follow up with leaving the clutch master cylinder cap off/bleeder closed/engine off...and pump the pedal real fast for about a minute - wait a minute and repeat.