In theory you can get contact with your higher profile vanes due to launcher bounce, especially if you don't trim the dramatic hook arms and they sit up off the shelf at all.

Follow me.

When the bow is drawn the limbs compress providing slack to the cord and the launcher to rise via the reverse spring. When the bow is fired the limbs snap back to their resting position yanking the cord tight and the launcher arms out of the way. HOWEVA !! IF you think those limbs snap back into their resting position and stay there under all that violence at the shot?? [:-]
Conventional limbs act like a diving board as they settle out their motion after the shot. All it takes is one bounce of the limb tips downward to release some slack on the cord allowing it to "bounce" back up causing a potential contact issue. I imagine with a high energy conventional limbed bow that the launcher moves up and down at varying rates until all the motion settles from the limb tips.

With Blazers if you rotate the vanes slightly to gain relief from the cables you are turning that inside vane down toward the tip of your launcher........now there isn't much separation between the 2 and any bounce can cause contact at that point.

Like I said, just a theory based upon howthat restoperates and what I've seen from general high speed video of bows being fired.