For some reason, when I see a comment like "The reason to do [this] is that some employees' spouses' retirement plans have high administrative fees, so we considered setting up a new "clone" of our existing DC plan specifically for those spouses.", the first thing that I would assume is that the spouses are spouses of HCE decision makers. Decision makers otherwise tend to completely ignore issues concerning the plans covering the non-employee spouses of rank and file employees. After all, if those high administrative fees can be categorized as unreasonable and due to fiduciary violations, it is not the sponsor of THIS plan who may be named a defendant in a fiduciary violation lawsuit!