Coil wattage recommendation issue

Ok so I am currently using the geekvape z series coils. I use a .4 coil but my issue is that the chart on geekvape’s website has the listed recommended wattage at 50 to 60 watts. But the coils themselves say 60 to 70 watts. So now I am confused as to were I should set the wattage on my mod. Which range would yall go with the one on website or the one on the coils themselves?