Disclaimer: I mostly play at apoc because there's really nowhere else to play CTF ... meh. But there's good admins and good ownership there.
A stream of conscience about PZ flag:
Avoid going after hard to hit tanks with these flags:
Narrow, Tiny
Avoid because they can kill you:
SW, AS, GN
Everyone else, go harrass and kill:
Kill:
Laser, Rapid (these two are almost all powerful flags and have little defense against you), GM, geno
Harrass and/or Kill:
Everything else not mentioned above.
How to kill with PZ:
Get face 2 face with the enemy tank. Make sure they are engaged in small shooting with you (they do this as a deterrent in most cases) and then give them a good macro (as Colonel and his many incarnations/alters call it) fire. 7/10 times you will kill them without getting killed but as always ... WORTH (especially if they're toting G).