Nabius has 2* 378 weapon, Rydia has at least one (wearing pvp gear right now) and you're still rocking on two 359's. While the rest of your gear looks fine you really lack on that department, that's at least 2k dps difference from simming alone (not even counting for double dipping with deep wounds munching).
Looking at your Baleroc logs:
Attack / You / Nabius / Rydia
BT: 49 / 58 / 57
CS: 9 / 11 / 11
RB: 19 / 24 / 26
Exe: 11 / 15 / 17
Slam: 17 / 13 / 11
HT: 2 / 0 / 0 (it resets your swingtimer, don't use it unless you're not at the boss)
[Rydia didn't even use a potion and Nabius didn't prepot so they have lots of wiggle room.]
You was the only one to pop shield wall so it's not a fair comparison, but even while stancedancing you shouldn't delay BT. Don't try to hard to get every slam procc of and focus on your harder hitting styles.