I have a bit of a nagging problem with my clutch pedal.

When I brake with anything more than moderately hard pressure, by clutch pedal falls halfway to the floor. It doesnt happen every single time I brake hard, but most of the time. And it is more likely to happen if I brake and turn and use rev-matching for gear changes.
The pedal will return to normal on the first pump but this is becoming a major annoyance now. There are no problems during normal daily driving.

The clutch was replaced on last friday with an Exedy standard replacement kit. NOT HD. Included a new pressure plate and thrust bearing. My spigot bearing was inspected and is fine.
And the clutch hydraulics were bled and fluids replaced just earlier this week. I did it myself using the reverse bleed method with a syringe. I am confident there is no air in the lines.
HOWEVER, this problem I am having was occuring before the clutch change and fluid bleed also.

Any thoughts from the pros as to the cause?

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RS Liberty - Because WRX's are only good for parts...