Carl's Max Y Grip maybe a bit different. It's not so much a offset grip but a way to drill a ball a different way using existing fitting philosophy. For instance my grip is 4 1/4 x 4 3/8ths RH and that is nothing unusual.
Here are my numbers. 4 1/4 x 4 3/8 span. Thumb is drilled with 1/8 reverse x 1/16th left at 22 degrees. My fingers are drilled 5/8L 3/4R with 0 F/R at 43 1/2 degrees. (these numbers are approximations since my drill sheet is down stairs and I can't recall the exact decimal numbers but you get the idea.)
Now since the fingers are not drilled at 0 degrees the ending pitches are different than the starting pitches and I've tried a thousand times to just take the finish pitches and drill them as a normal T grip and it doesn't feel at all the same.
I end up with about 1/2 Forward in the fingers when you take the measurements off the T grip and I will tell you it gets off my hand cleaner with more axis rotation than anything else I've ever thrown.
I'm not going to get into detail about it because I promised I wouldn't reveal the secrets of the grip but it is indeed another option to fit for people who are looking for a change. http://www.gripcheck.net/index.html