Yeah, I'm guessing the light attacks just seem to figure a higher rate of damage due to the speed that is attached to said attack (over the "heavy attack", that is). If I have popped a liquid vim for one of the big bads, I have grappled, then I use Hundred Kisses, with the daggers, or Dire Gourge with a sword, if playing Assassin. I still use both of those with out using a Vim, but I have to pay better attention to my Stamina, and either switch to regular light attack, and/or pause and consume some mushrooms or other stamina replenishing pots.
I go heavy offense with everything, though I add a little defense for Mage/Sorcerer. When I play either of those two classes, I use Acuity, Attunement, Articulacy, Inflection, Gravitas, and Sinew. Inflection gives me some added defense, and Gravitas helps me from getting interrupted with my casting. Sinew....well....I tend to never leave home without it.

Now, I do admit, under level 100, it isn't uncommon for me to use Bastion or Awareness, going into some of the beefier fights. I will usually swap out either Attunement or Vehemence for whichever defense (regular or magick), that I am more lacking, or I base it on the type of attacks I might get hit with (melee versus magick). But again, that really depends on the circumstances. If I am building well enough defensively, and I have some good armor pieces, then I will feel less inclined to add the defensive Augments, once I am over level 60 or so.
Should be noted though, I do NOT play on hardcore. One of these days, I may give it a go. But I generally don't have a whole lot of patience for dying a lot. LOL! I do enjoy some challenge, but having to redo fights repeatedly is not something I deal with well. I curse like a sailor, irritate my husband, and scare the pants off my dog. If he wore pants.