That spike up at the end of blue run means you either had some wheel spin or went down hill slightly. Thus it's not true :-P. I've had a few of those myself, I just have to choose a better stretch of road for them.
It's hard to find a good road I can do side to side runs on, I really wish we had more real dyno's, tuning is a lot easier when you can see WHP gains from side to side runs