I tried every way possible of installing the Google voice app.
Fresh install of market version and then trying to install this on top "application not installed"
Complete removal of Google voice app and then just installing this...force close.
A copy over of the apk to the /data/app folder, change permissions to full and install "application not installed"
A complete uninstall of the Google voice app, copy over of the modified apk with full permissions and install "application not installed"
Not sure what else to try.
I tried a lot of what you did as well. Google+, no problems. Google Voice, keeps force closing.