26 V's 29" Stumpy Evo's. 2.3 Ground Control Rear/Butcher Control front both bikes. Float 34's and RP23's on both bikes. Same bar with and very similar reach/stack. Approx 3-5psi less in the 29" tires. Same trails and dry/loose conditions.
Yeah the 29" has more grip but more importantly is the way it breaks away. Much more feedback and predictability on the limit. But I do attribute the longer rear centre on the 29" to be half of the reason fo the improvement. Bottom line is geometry has at least as much as an effect on performance as wheel size.