For anybody else with the PerfectFixes - here's the scoop.  After you convert V4 to V4~WM, then you need to run her through the Perfect "conversion" process.  Their documentation tells you what to do.  At that point, you can save a new cr2 file.  You can either load the PerfectFixes or not.  I found that loading her up with all the fixes and all the Morphs++ and the Elite Body and etc etc etc caused problems.  So I just left her prepped for Perfect and loaded with the basic stuff like Morphs++ and A4, which I use a lot.  Then if I have problem with a specific area that I think a PerfectFix will fix, then I load that one.  It seems to work.  Mostly V4~WM fixes herself just perfectly, but there are a few things I like, the feet for instance can be shaped better and I got her into one pose that did something wonky with her calf, loaded up PerfectLegs and that reshaped the contact area between the shin and the thigh so it looked better. 

If all I planned on using was V4~WM and I didn't already own the PerfectFixes, I wouldn't go out and buy them until I was sure I had a need.