Jerry,
Going into the "Pick and Prime" thought a little deeper, the real thing you are doing there is not clearing the vent hole. In actuality, prior to picking, the surface area that is being looked at is whatever can be accessed through the vent - not much.
However, when you use the pick, you are actually opening up a conical area in the compressed powder which greatly increases the surface area the flash has access to. Hence, the ignition characterics of the firearm are increased.
Regarding hole size, personally, I like to protect the threads of the touchhole and that's about it.
It should not go click, whoosh, bang. If you can identify those various steps, it's toooooo slow.