ALSO: I cannot edit this in to the original post, but I've been trying this out on friend's sorc and its working pretty well.
Another Dueling Strategy:
You have to set "asdf" as hotkeys to do this. It works against all chars, but defensive casters who tele a lot or chars with lots of Fhr make it tough. Works SUPER well against Zons cause you can dodge-lock them. Works MUCH better with 200% fcr than with 105%.
Set Firebolt (or ball, your preference) as "a" and set Telekenesis as "s" (you can have teleport as your right click)
Namelock the opponent with Telekenesis. Keep casting it. Switch really quickly to FB and let ONE ball out. Switch back to Telekenesis. Once the ball hits, switch back to FB and let out ONE more ball. Switch back to TK for the knockback stun. They will be unable to move out of the way of your attack because they are stun-locked by the Tk. Repeat this process until the enemy is dead. It may take a little while with some chars because you're doing 1 shot at a time, but once you get them locked they're pretty much done.
Also, once you get them in a good Fhr lock with TK, you can try this:
Send 1 FB at them. Switch back to TK. Keep casting TK. EXACTLY AT THE SAME SECOND that the FB hits them, teleport on top of them, maintaining your namelock. Then unload FBs on them. This works better with the 200% fcr because your 200% fcr FBs can fhr-lock them.