The hydraulic system is self-adjusting, so you can't really do anything there. The pedal height is adjusted by the push-rod that goes from the pedal into the master cylinder. There's a lock-nut out near the clevis which attaches to the pedal, then you twist the push-rod to adjust its length.

I agree with MrFatBooty - push the pedal down all the way. That's all about the clutch disk & pressure plate. Its not about cable vs. hydraulic, or really new vs. old either. Just every type of car is different.