How to set up another constant limit / rotation constant for iPhone 6+?

I noticed that the leading / trailing interval for iPhone 6+ and iPhone 5 / 5s / 6 is different. For specific needs, 5 / 5s / 6 requires -16px from the master / trader to fit the screen, while 6+ uses -20px. What can I do to fix this problem?

So far from the only thing that came to mind was to add two constraints (-16px and -20px) for Leading and Trailing and put -20px one with a different priority. But that didn't change anything. What else can I try?