Adobe Premiere might be BSOD'ing due to the shoddy Intel graphics drivers but I'm not certain on that. I guess I could download the demo and see how that runs. Is there any particular thing that I can test that will reproducibly cause a BSOD or is it seemingly random?
Off the top of my head from reading these forums for a long while, allegedly Dropbox is terrible for battery life, presumably due to frequent syncing and file monitoring. I don't use Dropbox thus can't really test that for myself. I've never used Bittorrent Sync but, having looked up what it does, that sounds like something that would also cause battery drain similar to Dropbox.
Basically, if that pic of your Task Manager is a representative sample of your typical idle/light load, then you are probably suffering battery drain because your CPU cannot properly idle due to all of those background tasks that add up. It's not that any particular one is high but that there is that much demand from so many programs. If you go to the Performance tab of Task Manager, you'll see the current clock speed of your CPU. If your CPU isn't spending most of its time under ~1 GHz (for the Core i5, ideally 0.5-0.7 GHz), you will have < 6 hour battery life. I've been more closely monitoring my true battery life lately (as seen in this thread:
Tracking Battery Life), and, so far, I'm getting somewhere between 6.5-7.5 hours of battery life but with CPU usage usually < 3% when I'm not actively doing anything but still have programs open. When I check my CPU clock speed, I'm generally under 1 GHz with momentary but regular spikes into the 1-2 GHz range. If you could post a summary of your CPU usage and clock speed, that would be great for getting an idea of whether the battery drain you have is due to the CPU not idling.