You need a new slave anyway, so go ahead and install and power bleed. Then if you have access to a LED illuminated borescope 9as you mention), then use the scope to watch the arm, throwout, and whatever else you can see as someone else puts mild pressure on the clutch pedal.
I have not noticed new clutches being much harder than the old ones. If anything they are easier to depress. The pressure point will move, but the total pressure should be the same or less, unless you installed a race clutch with heavy springs or something. The pressure should still feel progressive and the arm should still move in proportion to the pedal. I seem to recall a square hole that could be used for the borescope, but I am not sure what you will be able to see. I have a borescope with a digital camera integrated, if yours does not, you can always take a pic of the borescope LCD with a dig camera. I dont expect this to help because I cant even tell you what to look for specifically. I have not heard of the arm binding.
It sounds like you are well versed with the clutch install and you used a "kit" with the throw-out, clutch, pressure plate and you put lube on the guide.
I dont think I will be much help, i will review any dig images from the borescope. But i am quite interested in the outcome, so please post the resolution.