How are the deadsticks happening? Is it at full throttle, when transitioning, during a maneuver, at idle, or random? How does the engine behave when it deadsticks? Does it gurgle and surge, get low on power, or just quit suddenly? Have you worked it on the test stand and checked the mix with the nose up? Have you checked the tank lines for leaks (it can happen to new ones)? Have you checked all of the bolts and locktited them in place? Carb and needle valve o rings ok?