[fiveohpatrol]

Have you checked compression?

If I were you, I wouldnt have gone to a dyno and pushed it that hard with only 300 miles on a new motor.

Could be your rings havent set yet and you arent getting full compression. But then again, I'm not internal engine expert (or any kind of expert for that matter) so I think this is a job for supermechanic (PKRWUD)