In the framework of standard pve specs, as long as they are playing optimally, the majority of a Rogues' damage is going to be from white hits. Regardless of being dagger or sword spec. Daggers just have more yellow damage than swords, but it's still not the majority.
The reason you don't see rogues with over 310 weapon skill, is because the glancing blows reduction is the only thing that matters (realistically). The other benefits are just small bonuses.
You would be better off staying with ACLG and no Mugger's belt. You'll be wearing those gloves until you can get your hands on a Death's Sting.