Your DPS is about right for 530ilvl, and yes the jump to 560-570 is a huge one, normally includes legendary meta gem/cloak which also adds a tonne.
Dont open with EB, priority list is FS>LvB>EB>ES@7stacks>LB, keep searing totem up sure, make sure you use fire ele at a time during a fight its gonna hit on the boss for its duration, fire ele is like ~20% DPS. I assume you're also using ascendance once or twice per fight. Try stack one with hero, make sure FS has more than 12 seconds left before you pop it, also best to do when LvB is on CD to reset CD. Can pop SWG just before as well in case you gotta move
Edit: Wait wut. Why are you gemming expertise?
I advise you read this guide to learn basics of spell and stats priority, dont know how you have Mr Robot set up but you dont need expertise.
http://www.icy-veins.com/elemental-s...-pve-dps-guide