That doesn´t sound like a slave cylinder problem to me. The slave cylinder will extend the same length no matter what gear you are shifting into, and therefore it will disengage the clutch the same amout no matter what. Same with the throw out bearing, it will affect all gears equaly. Sounds to me like there may be internal damage. Either that or there is something blocking the shift linkage from being pulled backwards see as how 2,4,and R are all on the backside of the pattern.