Still very fuzzy on the explanation, but I agree totally with dial back timing lights and msd boxes. The (M)ultiple (S)park (D)ischarge stops happening at about the rpm that you are checking it (3000rpm) Depending on the inductive circuitry in the timing light, this may be why you are seeing unusual readings. Try going to 4000rpm and see what your light tells you. At 4000 you should only be getting one spark per cycle and that may make life on your timing light easier.