I will redirect you to this thread, where Tjwhale and I deconstructed the consequences of perhaps every single variable in planet generation. Tjwhale has also written a really great piece of code that you can find linked somewhere in the thread. As for things you should be able to tweak, in my opinion that would be the star type, axial tilt and perhaps even the speed at which your planet rotates around its own axis (these values have some bigger implications, as you can find out in the thread).
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