Hi Sal !
Using the knife isn’t the problem - I love the contoured handles and thick blade stock. That said, I tend not to use the front choil (on this or any of my paras), making the nub a bit less critical from that aspect of use. However, I am contending with a few other things, some of which are more important than others:
1) one of my favourite fidgit tasks on my paras is to hold down the comp lock and flick the blade incessantly. Drives my wife crazy. Makes my day.
2) I have years of muscle memory with the Paras to keep my finger in the comp lock hole when closing the blade.
3) on my CF Shaman, I have actually dropped the knife (and almost dropped it a few times) when aggressively closing the knife and having the nub push my finger enough that I lose my grip on the slicker CF (G10 versions not a problem)
4) while I love my CF Shaman, I still rotate it amongst about two dozen Spydercos, many with comp locks, so my idiot brain has trouble remembering to move my idiot finger quickly enough when closing the Shaman