I downloaded  2013-12-10  release, but the speed is exactly the same.
(maybe +1 khash/s, but mostly the same ^^)

Any other old releases i should try?

Edit: okay, seems like +3 and sometimes +5 khash/s more with '2013-12-10'
It also seems like it is getting faster

Edit 2: temp is down to 68 °C (from 74 °C) with  '2013-12-10'. Nice.
I am gonna stay with that version for now.