i have the same problem, fitted a new clutch, then it went really light, so i bled the system, and it got worse, i now have no clutch at all. however, today, i replaced the slave cylinder for a second hand one i had spare, and made a bracket to hold the slave push rod in place, then bled the system rechecked for pressure and repeated until i got a solid pedal. ive left it pressurised over nite, and will update in the morning. apperently its something to do with the difference in pressure of the old clutch plate and the new one :/