Zack,
Keep in mind that the stiffness and recovery rate of the graphite used to make a rod has very little to do with how the rod flexes under a casting load. For example, the CND Custom Series rods are made of a pretty stiff and very fast recovering graphite; however, they are not a fast rod by any stretch.
As for how a fast recovering, stiff rod meets spey casting needs, it depends on the type of action the caster prefers, the flex profile of the blank, whether the blank is progressive or regressive in how it distributes increasing casting loads, the line being used, and the skill of the caster. As I've made not secret, I like fast recovering, medium-stiff to stiff, progressive rods with a strong tip so the tip doesn't collapse when casting a long-belly line. Many folks consider rods of this type (T&T, Loomis GLX) to be too fast and stiff for good spey casting; however, there are many of us who don't like a rod unless it has these characteristics.
Therefore, the answer to your question on whether they would meet the needs of spey casters is: It depends on the caster and what he likes in rod action.