See, screenshot 1 is odd unto itself. With wifi and no use, that should be more flat.
Now, I find running ANY rom on this device at 1.512 to harm it, so I scale my cpu back to 1.296. For BO, I use the gaumaufry (sp?) governor and I had a far flatter line than you. Stay away from on demand... It spikes you cpu to max when ever its 'called', so battery drain is noticeable.