Optimizing triangulated sloped surface

Hello everyone!

I hope you could help me find a better and workable solution for my problem.

I want to design a gallery floor in a slope (about 2 meter). on the way I want to have these flat "islands" to show the exhibits (in green).

also I wish for the slopes to be a maximum of 3 degrees.   

so I've made a grid of points and used delauney mesh for making the triangulation, and used Galapagos to control the z factor of the point while trying to get to the score of minimum faces over the 3 degrees slope.

it takes too much time for the process and I don't get good results.

thought I could share it here and see if you have a better idea or know how to do this kind of thing in kangaroo (if it possible).

I've been using the SmartForm analyser plugin for evaluating the faces slopes:

http://www.smart-solutions-network.com/page/smartform-analyser

thank you very much for your time.

Yoav