DSS sent me the wrong CV, too, even after having me take a measurement to (supposedly) ensure they were sending me the correct part. Rather than waiting for them to ship me the correct CV, I ended up shipping everything back to them (axle with bad CV + the wrong CV they sent me) to have them assemble it. So, yeah, not real impressed by DSS's attention to detail or customer service in general.
I have an 8.8 swap in mine. I did it out of a desire to have a quieter, more capable diff; I've never really launched the car, and have only gotten wheel hop a handful of times, so that wasn't my primary concern. I was on my 4th Getrag diff and it was just as noisy as the previous ones, so I wanted to fix that once and for all. Unfortunately, I spent shit-tons of money and didn't get what I wanted. I still have a whiny diff, even after having two different shops take a crack at rebuilding the 8.8 (with all new Ford gears both times). Maybe I had crappy shops to choose from and they did a poor job on the diff both times? I don't know. Just pointing out that the 8.8 isn't necessarily the cure-all.