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From what you described Bruce, it sounds to me like your motor is running out of gas (need bigger jets) as it pulls up on the rpm band. Did you use an A/F ratio sniffer during your tests? If so, what was the A/F ratio along the hp chart. You may want to bump more advance timing into the equation also. FE's like a lot more timing than 30 degrees full advance. If you are not using nitrous or a blower, start at 38 full advance and keep going after each pull until around 40-42. Remember to make sure your A/F ratio is around 12.5:1 - 12.8:1 during the pulls. If this doesn't work, than like Clois and Fred say, you're runnin' out of cam.