|the 470rwhp tune, or are you just looking at dyno numbers? Do the HP/Torque curves look way different than before, or are they pretty much the same shape? Are the HP and Torque values the same at 5,252rpm like they should be?
Given that your torque result is higher than your prior two dynos, I wonder if the dyno software isn't calculating HP correctly. If that was the case, your tuner may have done a proper job tuning your car, but the dyno is giving misleading results. The good ol' butt dyno will easily tell you if you're actually down 100+HP or not.