What "Hardware Version" are you on from the System/Overview screen?  I was just looking at mine and realized one of the newer machines I got is at 1.0.1.3 where my original (batch 2 I think) from May 2017 is 1.0.1.1.  The thing I noticed is that the newer machine is running at chip temps of ~48-50 and the older machine is running at chip temps of 60-63.  Both are set at the same out of the box frequency.  Made me wonder if my newer box already is a L3++ and has plenty of room to over clock.  Will be interesting to see the hardware version on the new ones and what the frequency is set to.