There are no heights in relation to raising the flap. There are only speeds.
There are heights when the manufacturer specifies them in the AFM. You don't mess with this stuff. Both types of commercial jet I have flown specify it for the reasons given in my first two replies. Not for reasons of pure numbers on a chart.
[5]Your haven't mentioned obstacle clearance anywhere in your comments.
Because its a total red herring
Scares me.