Looks like you are using 350z axles with adapters to the 2x3 stub shafts. I'm guessing they are the Maverick adapters? Have you had any issues using that setup? I tried the same adapters and axles on my coupe, after installing everything i drove it around the block to check that it all worked and both inner cv's failed and fell apart inside the adapters... So that was a no go and I went back to stock axles
It seems like that the adapters having the centers machined out leaves nothing to hold the cv grease cap and internals in the cv so everything just popped out and broke.