I am not overly familiar with the "new" type of engine, but if the bottom part is the same as the old one, I'd pull the "bucking bar" out and make sure it's straight and lubricated so it works properly. It sounds like it's bent slightly and not moving freely.
When the preload is right, you should be able to use the handle of a hammer or some other "non marring" object and just be able to move it with a good hard knock.
Unless you are very small or have a condition like arthritis, you should be able to move the clutch arm with your hand (it won't be easy, but you can.)
Too loose- the clutch will drag and not turn the engine over.
Too tight, and you will either pull the cable stay off the end trying to pull the clutch in, or it just won't disengage.
You've described a problem with the bucking bar (push rod from the arm to the center of the clutch.) if I read it right.