@syxt, made this post a bit ago, changed the setting and it seems to have made some difference for me. I'm on 384 though, but hopefully it helps for you too. 
http://mybroadband.co.za/vb/showthread.php/269349-MWEB-Gaming-Feedback?p=6021104&viewfull=1#post6021104
Also, make sure you're not running some silly addon's that "crosstalk" with others in the party/raid. I had issues with that not too long ago.
http://mybroadband.co.za/vb/showthread.php/269349-MWEB-Gaming-Feedback?p=6021104&viewfull=1#post6021104
Also, make sure you're not running some silly addon's that "crosstalk" with others in the party/raid. I had issues with that not too long ago.