I try Bfgminer and the latest version 4.4.0 of cgminer and my units run faster on cgminer (35.24 Gh/s one unit and 34.69 Gh/s another one).

About the temps. I found some info. If the unit reach 50 degrees (celsius) automatically it will drops the clock frequency to 200 MHz. If the unit reach 60º it will stop hashing as a protection mode.