Second - your spec looks good, good choices of glyphs. Rotation sounds pretty reasonable, though I will say I usually don't charge in [except for a few specific pulls, like ToChamp trash before Eadric/Paletress]. If mobs move out of the way before you get to them - very easy to happen for larger pulls - swipe might miss.
Aside from that - pop Berserk on bosses [or large/nasty trash], and otherwise just do your best to maintain aggro on multiple mobs.
To check - you are using Maul at every single opportunity, right?