Your weapon attacks have nothing to do with aggro, its all going to be based off of your yellow damage. You want to be casting something atleast every 10-12 sec. to keep good aggro and make sure you have the right abilities that are going to be giving your def. buff (ice) or health buff (fire).
Dom. has no effect on your aggro its mostly just going to be use for your knock down/pull spells. the more you knock things down the less they will be attacking you, a good pull move is good to get things off your hlrs/trollers.
As far as weapon attacks I say go with what ever you feel most comfortable with, each weapon has its own stuns which are nice to keep the damage you take down also.
oh yeah I also have a hlr about that lvl so hit me up next time your on your tank I'll run with you.