In MY opinion, the Pearce extension does NOT make the gun less concealable, but it DOES make it more pleasant to shoot.
What seems to make much more difference to me is WHERE I carry.
For me, at the 4:30 position, the weapon prints, regardless of which magazine. But at the 3:30 position no one sees anything, again regardless of which magazine.
First, you need to find the holster, cant, and carry position that works best for YOU. After that, the pinky extension won't matter, except for making the gun much more pleasant to shoot.
Duane