
My early Pantera that does not benefit from the modified effort-reduction linkage of the newer cars and here's how I would rank the efforts on a scale of 1 (least effort) to 10 (most effort).
my Infinity G37: 1/10
1983 GT5: 3/10
My 71 Pantera: 6/10
Denis' Mangusta 18/10
I mean seriously, there is a problem. Since it has a new clutch and a new slave, is it possible you might need to change the master. We know the pedal linkage is moving freely, so unless there is some serious corrosion constricting your lines, I would start with a new master before I put another new clutch in.
Mark