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You must have forgotten this is a big holiday. Most people are not even reading this site.
Cam design could be the culprit. I had a cam that peaked around 5000 rpm, changed cam to one that was designed to peak around 7000. Maybe ask you cam guy?
The problem really could be anything, based on the utter lack of info you provided, but I will take a stab at it. I'm betting your timing flatlines after peak torque.