I find this theory a little odd.
Let's say 37 is enough, I assume you're saying it'll be enough because of goal difference or at best 1 point.
Which means we'll be heading into games v palace, Spurs, Burnley (away), Utd and Liverpool, hoping we've already reached the magical 37 while desperately trying to work out what Stoke leading West Ham 3-1 halftime means.
Shirley 40 points is the accepted norm and does away with end of season nerves.
Why is it odd? You might as well just say that 45pts or 50pts mean you're safe. 2003 West Ham were relegated with 42pts
2012/13 37pts would see you safe.
2013/14 34pts etc
2014/15 36pts etc
2015/16 38pts etc
2016/17 35pts etc
At the end of the day, we just need to target as many as we can get but drawing games at home from winning positions is going to make it hard.