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When I worked at Ford, (not a tech) we replaced tons of the slave cylinder tube kits for similar problems and some would keep the clutch from disengaging at all. Here is the TSB for it.
99 F-series with low clutch pedal:
There is an updated clutch master, slave and tube assembly available which is preassembled and pre-bled. This also requires use of a new clutch master push rod.
Ensure that the slot on the clutch start interlock switch is aligned with the tab on the master cylinder; misalignment can cause a loss of full master cylinder piston movement.
Clutch hydraulic system F81Z-7C522-AJ
Clutch master pushrod F81Z-2143-BA