I rolled an instance group specifically to do all the PvE instances at roughly the right level; I'm not interested in world PvP at all. I did BRD at 56, and it was a very fun and easy clear. The fire elem 3-pulls before the MC attunement do hit hard; I'm not sure what group setup you have, but I found it fastest to just burst them down while using pally ranged taunt liberally. The rest of the zones I would do at 58-60. At 60 they will still be a fun challenge, but any higher and it will become too easy.