As I run with a tank, I can't give personal advice - I didn't clear the place until 64, but that's because of the last boss - 5 grounding totems should may make that a bit easier. In any case, the wiki has a page for each instance, including what level what teams have had success at clearing it - here's the one for Ramps:

http://www.dual-boxing.com/wiki/inde...lfire_Ramparts