RAF boosting with 2 70's

[Hat]

Has anyone tried RAF boosting with 2 70's? How much xp loss do you experience? Basically, my gear isn't good enough to just boost through say, Scholo with one 70 alone, and so I was wondering if 2 70's would lower the xp gain too much.

[Caspian]

I did this once, same boat, gear not good enough on just 1. So it was 2 70s and 2 RAFs at 50. Did ~ 90-100k XP/hr on each. It wasn't bad but, I can do more just questing the RAFs alone. Ungoro and WPL can get 150-200k/hr with 2 RAFs on Quests.