no matter how much you tweak it, it nearly impossible to match their feel.
this is because there is energy and motion lost in the transfer of your foot action along the shaft of the double pedal.
the only double pedal which claims that they have no loss of transmission is Pearl's Demon Drive.
i haven't tried it though but i doubt if it has totally eliminated this slave pedal problem.
since you have a Pearl double pedal, try moving the spring assembly to the slave pedal and play it.
you will notice that the lag is more pronounced at this setting because as said earlier, their is energy and motion lost in the transmission shaft of the pedal. hope this helps