Unfortunately for most explanations I've seen for what might be described as a "wiggly lens" the only thing to be done is to give it time to most likely resolve on its own in some indeterminate number of months as the eye heals the lens more firmly into place, and your visual system neuroadapts to the lens since it is different from a natural one.
I would suggest however confirming with an eye surgeon (not just an optometrist if one is doing the postop visits) that there are no other eye health issue involved and to be sure there wasn't any glitch with the surgery that might be fixable, or indicate further action is needed (like if the lens isn't entirely in the capsular bag, or if its torn and the lens needs to be sutured, etc).
For the first 6 weeks especially the lens may still be healing into place and be a bit loose. The artificial lens is smaller than a natural lens (especially in the case of those who are highly myopic usually) and the capsular bag the lens is in contracts and heals around the lens to hold it in place.
I've been having what sounds like similar issues, I've posted some links to descriptions of it elsewhere on the this site in my thread about my experience getting the Symfony IOL with my cataract surgery:
http://www.medhelp.org/posts/Eye-Care/my-Symfony-IOL-results-after-cataract-surgery/show/2425258
though the issue doesn't seem to be the optics of this particular lens since people even with monofocals seem to have something similar.
In my case I'm just past the 2 month mark, and the lens seems to be healing well in place within the bag so its less likely moving within the bag. It seems to be a more rare issue of the iris jiggling (since the smaller lens provides it less support), iridodonesis, and likely the capsular bag/lens along with it. Multiple surgeons have suggested there is a good chance this will resolve on its own with more time.