One of the sure methods of eliminating orks from a world be to destroy the entire biosphere (I.E. Exterminatus), then tarraform the world, and restore the biosphere from collected samples that have been sanitized of ork spores. It is a very costly and time consuming process even for G/DAoT humanity, it is monumentally more economical to quarantine and contain.So while G/DAoT Humanity were more than advanced enough to deal with Orks, they couldn't exterminate them like you seem to want.
Yeah the one thing I really don't like about planet is the high gravity.Hostile Wildlife, Harsh Weather and High Gravity mean that construction costs and time are really gonna be hell since everything needs to be be build to tolerate the high gravity , withstand the constant bad weather wearing away at it and be able to protect against the wild life
//Edit: Fortunately we have extensive grav-tech. ... Yes I just realized.
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