As JT stated, EO climb is based on certain criteria, namely ISO temp and alt.
Get it hot out, and you are going no-where very fast. I have seem many, many climb gradients when it get to be 30-35 that are in the 100'/nm range, add some alt, like in China, and you get to the 50-60'/nm range.
Dont forget to take into account the add to the DA/MAP so you dont bust the MDA trying to get the thing to start climbing again. 50' momentary descent while EO? or on a hot day..no way.
This is one of the major reasons you see the much higher DA's with a tailored procedure, the EO missed part of the adventure.