By long, do you mean vs. a Phoenix or an extra 3" on a standard Incubator?
As far as the width, I haven't found that extra length (a full UQ vs. a 2/3 or 3/4) goes up more around the shoulders. To me, it was depended on the width that it was used in the pattern. I really like Adam's 3D design. The inner fabric is shorter than the outer, which means that it wraps around more. You don't have the excess material on the inside that bunches up.
Glad you like it! It will likely work for you even below it's rating.