I have "fixed" most of my heat and fan issues as well as battery use during live use by doing similar things as others. I turned off Hello Windows, switched from Edge, used ad blocker, block most background apps. It runs pretty much cool and quiet now. It sometimes heats up and spins the fan during charge, but it hasn't stayed hot or loud during the entire charge cycle in the last few days.
However, I've decided to return the SP4. The battery drain during sleep is too much for me. I'm still getting 2-4% battery drain during sleep. This makes the device unacceptable as a travel laptop. In a 12hr period, I can lose up to 50% of my battery while it sits in my bag. Unfortunately, I believe it's the OS. Windows isn't aggressive enough about power management. I think I will return this machine and get a Skylake Macbook Air or Macbook Retina in the Spring. Those machines have 30 days standby. That's not just marketing. It's real. I don't like to keep a laptop always plugged in. It's not good for the battery life. I had the XPS 13 for awhile after seeing claims of 7-9 hrs, and I experienced the same battery drain. Lenovos tend to do pretty well for Windows machines. Their standby can last a few days, not 30 days, but still decent. They have their own power management software. Microsoft needs to get aggressive about background tasks, web browsers scripts, and flash or they'll never be as good at power management.
I found another bug. The USB 3.0 port is slower than it should be. I have an external hard drive with a Samsung SSD. On my Mac, I get about 430-450MB/s transfer. On the SP4, it gets about 270MB/s. Could I dig in and find registry keys to make it up to par? Maybe, but I'm quite tired of having to find workarounds. I paid $1750 for the i5, 256G, 8G model. I really should not have to try to make it work. It should just work out of the box.
In the mean time, I'll just continue to use my work MBP and personal Dell Precision laptop with Ubuntu for software dev work. That leaves me with no personal laptop for photo and video editing. I wish you guys who remain with the SP4 the best. It's a really, really nice device but doesn't fit my usage pattern. Too many bugs, too many compromises.