Well, I wrote it like I changed everything all at once but in fact I did phase in changes and wait for results with the optimizations first then the AdSense changes second. Yes, it's very possible it was all coincidence in timing but I find it very hard to believe as over the course of the last entire year that all my changes coincidentally resulted in an upsurge of 300k visitors in 12 months. My changes were designed to improve my SERPs and so far they have never failed to have some level of impact.
Likewise, when I started manipulating AdSense it was based on research that concluded with specific changes (and lots of testing) will increase CTR and CPM, etc. When I made most of the AdSense changes it started having immediate impact, some within a couple of days after return of the media bot. One specific change boosted CTR almost 50% on the spot when I uploaded it, the rest of the day's earnings doubled as a result.
You could be right, it could be all coincidence, but based on my 12 month trends of making changes and improvements follow, I think I'll opt to be optimistic it was my changes for now and not random chance.