Gave up trying the this way.
Ended up using GUIMiner-scrypt
In AMD OverDrive I set core to 885, memory to 1300, fan on auto, power control to +20.
In GUIMiner-scrypt I chose the 7770 preset and then changed the Intensity to 14 as I work on this PC as well.
7770 now running at ~185 khash/s
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