I like the CBE sights / pins. The SL4 is a nice sight for the money. And with those sights, the .019 is fine for whatever you are shooting IMO.
As for the multiple pins, I recently had to add a verifier to my peep. The pins were getting blurry and looking very large. Making the pin gap look closer than it was.
If you want to step up a notch, the TL3 is a movable multiple pin sight...best of both worlds.
Why do they call it common sense when it is so rare.