I have been reading this and no one mentioned lubing the cable. Lubing the cable helps the lever pull more than anything else.
I lube mine by unhooking at both ends or removing the cable from the bike. Make a funnel from heavy paper or kitchen foil. Tape the funnel around the upper end of cable housing. Keep the funnel full of a light oil, I use 3in1 oil. Work the wire in and out, when oil comes out the lower end it's lubed.
Also inspecting the worm screw part of the actuator for cracks in the plastic. If cracked the pull will be hard and most of your pull will be used to take up the slack in the cracked part.
I found the part cracked in my 75. A new one and a well lubed cable makes for a clutch I can pull with two fingers.