I've been on Loop since Sep 3rd. My nights are perfect, but I still have unstable daily curves. The biggest achievement though has been that I rarely go above 190, because the system stops the spiking sugar well in advance, usually already in the 160-range and brings it down.
I saw that your target range is quite low and narrow, so I may try with that as well.
PS. The support from the AP-community as a whole (Loop, RileyLink, OpenAPS) has been incredibly great, making it possible for even me as a complete n00b to get the needed hardware but also to build apps, which would have been impossible otherwise. The creator of Loop got a job at Apple and their Health division recently and I just hope that they will let him run his own game there.