How to configure Rand3DElastic to achieve the same results as torchio.RandomElasticDeformation?

[Spenhouet]

Until now we are using torchio's RandomElasticDeformation. This performs a grid based deformation.
I'm now trying to achieve the same results with Rand3DElastic but I can not make it work.

Are they even the same logic / operation (generally)?

I fail to understand the parameters which Rand3DElastic requires and what effect they have.

Example results:

	Original	RandomElasticDeformation	Rand3DElastic
Parameter		num_control_points=7, max_displacement=7.5, locked_borders=2, p=1.0	sigma_range=(5, 7), magnitude_range=(50, 150), mode=[GridSampleMode.BILINEAR, GridSampleMode.NEAREST], prob=1.0
Image
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Especially, Rand3DElastic introduces these undesired humps:

Maybe someone could give an intuition on how to set the parameters to achieve a similar result to torchio (without these humps)?

[Spenhouet]

Does anyone have any idea?

These humps can be really extreme:

How do I adjust the number of grid points. It seems there are way to many grid points and the changes are way to local.