I had issues with my brand new MIP cvd's as well. My axle broke right where the hex pin goes in. My slipper is set good to where it lifts tires about an inch. I had some left over axles from my old GT that were spares. I put those on, despite the difference in shimming to the cvd joint. These set the dog bone in a bit farther but worked perfect to get me through my race. I did have to check the cvd joint after every run since the pin liked to keep coming out despite the locktite.
I had another issue but I forgot what it is. It seemed I had issue after issue with these brand new MIP cvd's. I've used MIP cvd's for years with No problems.