I started with my numbers at 80 and 180, and was OK with that, but only just OK. I wanted a little tighter control, especially on the high side. I have been gradually moving my setting on the high side down. I started with 170, then, a week later, 150, and now I am at 140. I believe I will stay with this high alarm setting for now.
On the low side, I have settled on 70 as my low alarm number. This is a simple matter of personal preference. Some people do not like the annoyance of being alerted so often. I don’t mind it because I believe I am achieving tighter control.
One more thing: I have the alarm rate set for the low alarm at 20 minutes between potential alarms; and for the high alarm a one hour setting between alarms. In this way, I know that I am definately low when I get an alarm -and cancel it without looking at it- and than in twenty minutes I am alarmed again. (If I am over 140 and get an alarm it would be potentially another hour before I would be alarmed again.) Thus I can tell the alarms apart even without looking.
Just some ideas for you to consider.