Who here has used a Powertrain Technology hydraulic throwout bearing?

hey guys, i ended up getting just the streetmax hydraulic throwout bearing, and after installing it, and bleeding it for ages, it still wont disengage the clutch! So now i need to find out whats going on and would love some advice, could there still be air in the system? Could the master cylinder not have enough stroke? It's a 3/4 bore 1.4" stroke. Theres about 5mm gap between diaphragm fingers and bearing face, pedal feels ok but just feels like it needs more travel.
Any advice appreciated thanks.

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