Clutch won't push pressure plate fingers help !!!

Hi guys, help needed! I'll start from the top, I purchased a Keisler hydraulic TO kit here in Australia a while back and damaged the bearing housing, can't get a replacement so I thought I'd set up an external slave cyl, using all the Keisler stuff (apart from the TO bearing).
The problem I'm having is that when I push the pedal, it's ok until the throw out bearing touches the diaphragm fingers, then it's as if it doesn't have the power to go any further, the pedal still has more to travel but just can't.
Slave is a willwood pull type, can't remember size of bore and the master cyl is a 3/4 inch bore.
The fork has been shortened to clear the headers too.
Can anyone she'd some light on this for me?

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