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@kano, you had mentioned earlier that you were doing some work on icarus support in cgminer; have you seen anything in the code that might suggest a reason for the observed throttling behavior?
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Nope, got it mostly all cleaned up and working last night.
(well I just found the problems and told him the fixes which he implement with other things he worked out)
But in this case, it was reporting random strange values and hashing at almost half the U: it should, but no they weren't related to the bitforce code that the icarus code is based off (fortunately for us, unfortunately for you)
Also, cgminer has gone through a lot of commits over the last couple of weeks while ckolivas works on getting his 7970 hashing as fast as possible ... including getting rid of an outstanding problem for the last 6 months (more ATI crap finally worked around) so maybe there's something in there? (2.2.7 was just released)