Okay, as far as posting the scores from the IBO 3D shoots, I believe speed comes into play there because of the unknown yardages that are shot. So, therefore, the faster bow(recurve) generally allows more room for error in the distance judging department. I'd be willing to bet the longbow scores would be better than the recurve scores if shooting indoors at spots at 20 yards. But I also believe it would be very, very close in scoring.
Quite possibly, the bow being cut just short of center(some longbows) may have something to do with it too as compared to the bow being cut to center or beyond center(recurves and some longbows) when comparing overall scoring. Possibly, the bow cut shy of center could be more critical of anchor point consistency than the center/beyond center-cut bow. I also believe the shape/size of the grip has an effect on accuracy, too. As you can see, there are many more variables apparent than just comparing the shape of the limb tips.