If I start out in stealth before engaging, I can get off Selection, Rain of Arrows and a Triple Volley all within the space of Focus Aims' 10 second duration. So they generally crit and knock up some nice numbers. That is with Poise, of course. As a rule, I parse just behind the Assassin. Some fights I'll beat him. Sometimes our Wizards nuke the **** out of everything and do insane numbers. I'm always right up there though.
A large portion of the time I'm raidleader and MA as well, and still manage to parse top two / three, so I'm happy with what I'm doing.
Seems to be working fine again though, so might well just be Chel's instance that screwed it up. It's never done it for me in any other zone unless I manage to stuff it up off my own back (it's been known), and I've been raiding for a long time now...