I dunno where you guys get "pessimistic" and "optimistic" from, the numbers by themselves mean JACK. It is so irrelevent it ain't funny. Just coz this one reads lower than others, why aren't the other "high reading"? LOL And wait up, go and read Factory Pro's "Dynojet speil of bullshiit" and you'll see that Dynojet dyno's read VERY HIGH and give unrealistic numbers. Hahahaha whatever.
All that you can see from that graph is the Sato slip on and the pc (with whatever map is in it) gave him 6h.p. Nothing wrong with that. My question is, was it custom mapped or just run with a map off the net etc? If the latter, you should get it custom mapped, and you will see a bigger gain again. The torque gain is great too. Seat of the pants dyno should make you pretty happy, and even happier having it custom mapped if it isn't done already. Have fun