personally, i moisten the tip somewhat by putting my cue under my lip for about 10 seconds. it only lasts for 2-3 breaks (depending on how fast you run out) so you have to redo it. this way, you dont have to damage your tip by scuffing it or scoring it.
It was suggested that I scuff my phenolic tip with #6 sandpaper. It made a significant difference, although someone said that if my stroke was competent chalk is not necessary.
This is true. You won't even notice the absence of chalk when your stroke is dead on. I've never chalked my j/b... so technically I could sell it as "never chalked" lol... but of course I would never sell it