Yeh, yeh, I know. Maybe someday I'll cap the other ones as well. They're not that far from cap anyway.. but I did start a second armourcrafter! So I'll have two LGM ACers soon.
As for the Warlock; It depends on your playstyle. My warlock has 1 Chamber (8 WC) and the rest of the points in Hex. (It's basically a very nice XP temp, but it's not that great for Thid.. baseline bolt with a huge variance. The DoT in hex is good enough to kill most enemy casters if it lands.)
Vampyres are just nasty since they come with build-in high resists. Root em and back off, as they'll heal themselves with the damage they do to you. I dumped a DD+DoT chamber, UI DD+LT, UI DD+LT on the Vamp, and he managed to heal himself faster than I could damage him - I died, and he was back at full health at the end of the fight. They're just a little OP.