I'm also having a tough time with slide stop removal. I've got a new 2012 marked P-01 with a couple hundred rounds through it.
It really requires a tool to push the pin through. And then, once it's through, it takes a LOT of force to pull it out with my thumb and fingers. I actually need a small pin punch to get it all the way out.
It shouldn't be this tough, should it? I just watched a YouTube video of CZ-75 takedown, and the guy just pushes it through with his thumb and pops it right out. Takes him seconds, not minutes.
So, what gives? Should I try polishing the slide stop pin to smooth the takedown?