The EXIF says you're using a 45mm lens, but I don't know of a 45mm lens. Was it the 43mm Lim? Or, was it the 16-45mm @ 45mm?
The first thing I thought was that you had a manual lens on it and forgot to set the focal length (I do that all the time
) but if it's a DA lens, that wouldn't be a problem.
K-7 or otherwise, if you're getting worse results with the IS on than with IS off (shooting handheld), it definitely sounds like a problem that needs to get fixed.
Especially if you're getting blur at 1/180s with a 45mm focal length!