A couple of suggestions.
-Lower cast time on tremor and goading assault and lower mana cost on these and our high damage attacks like blast
-Lower reuse time on plant(remove root and shorten cast time) and commanding aura or extend thier duration to 45 seconds and 90 seconds.
-Lower dmg taken to shield with tower of stone
-On the HTL skills even if my movement was slowed by 80% it would atleast let me reposition mobs a little easier.