:the SAE chart should be your official HP 'claim', not the uncorrected one. :Looks like your break up is due to detonation from going lean. :Notice how you start going lean again, then it breaks up and goes rich (fuel dumping). :Eitherway... symantic... *VERY* nice torque curve. :PS, when you post your charts, please choose a smoothing :factor and stick with it. It can really throw off the :details.
Why would you say SAE should be the offical dyno chart?