I had a problem like that on my truck. After replaceing the slave cyl.(It needed it). I notice that after bleeding the clutch. I still had slipage. The rod on the slave cyl. was max'd out. I look in my Shelton manual and notice that their is a rod that can be adjusted on the clutch pedal. I had alot of play(up and down) movement. The rod unscrewed itself making it shorter, hence more pedal play.(two nuts not tight against each other). Did that on the pedal, backed off the slay cyl rod,(Had lots of tension on the pitch fork. Making me think that the clutch needed to be replaced.) Until it started engaging about a 1 inch up off the floor board. The PO had it all wacked out. That worked for me. Just giving you a different idea to check on. Might just need to be adjusted.