I have the same issue....shifts fine low RPM's once I hit the high RPM's or trying to shift quick, I have to prime or double clutch it to go in.

I think I got a leak somewhere letting air in my system...I have tried bleeding and bleeding to no avail.

I also changed the MASTER last summer and the slave two weeks ago thinking it can be them....But nope problem still there...

Can someone help me.?