I believe the offset shaft went away with the 2012 boats, but not sure.
I've had a 2013,14 and 15 Carbon Pro over the last few years in South Florida on the promo program. Every year the boat has been better, especially in regards to driving. You can ask the other Senior Drivers at Okeeheelee and I'm confident they will say the same.
My current boat is a 6L and is very responsive to driver input....most people tend to over steer it on the first few passes but settle in realizing you don't need to turn the wheel much to counter the skier. The boat is very well set-up and came from the factory this way...didn't have to work the rudder.
As far as skiing goes, my boat typically gets assigned to the longer line and slower speed skiers in tournaments because of the wake characteristics. It's very good at all line lengths, but it does differentiate itself the farther you go back and the slower it goes.
Oddly enough, when I skied my 2015 boat for the first time, I noticed that the wakes were slightly softer than previous years. My ski partner who skis at 28-34 mph at 22 off noticed the same thing as well as a few other skiers. Granted, it's a 6L, where as I've always had 5.7L boats, but the weight difference is negligible. Both engines are propped the same. I talked to Paul Crawford about it and he said they moved the motor slightly and that accounted for the softer wakes. I told him over the past few years, everyone tells me the wakes are the best around...why would you risk changing them, and he said, 'We knew we could make them better'. And that says a lot about their commitment to the boat.
There's more refinements to come with the Carbon Pro and it's clear that Centurion is out to make the best boat possible. Highly recommend you find a promo boat as they are likely tuned better than most: http://www.centurionboats.com/promo-driver-directory.html.
And if you're ever in South Florida...