I had a similar problem when I first installed my Intel Turbo Memory. I accelerated most of my software packages, including Windows Explorer. I think adding the latter was the culprit: after I removed everything and excluded Windows Explorer in my second fresh load I haven't experienced the same problem again.
But, funny: now I have the opposite issue. I start with 25% of memory usage when I do a fresh load of software for acceleration, and after a few days it goes down to 15%, even 10%. Somehow ITM Dashboard excludes some of the files from accelerated software list.
See my original post, here: http://communities.intel.com/message/75294#75294
ITM is a good idea, but the supplied software is a disaster, I think. I would love to see an improved version, soon. At least before SSD get really cheap. :-)