If you're having problems with Google Partner Setup FC's, flash the DRC83 base "defanged" rom found
here and then flash CM on top of it. No wipe should be necessary.
The people having problems with Gapps FC's is because they're using an earlier release of the DRC 83 rom from HTC that had a problem with signatures. They've since corrected it, so you can grab the new rom from there (specially since the dl-links in HTC's site are down).
Remember not to reboot between flashes, flash both in one go, first the DRC83 defanged and then cm 4.x.x.x.x.x.x.x.x.x.....