If your issue is really is deformed (flattened) props... the cause for the deformation can be anything that press on the blades continuously during a longer period, during storage for instance. A prop holder sounds like a good candidate for that.Is it because of the props holder? Does the prop holder deform the rear props.
The issue for the Mini 1 was that deforming pressure what applied just by having the arms folded & store the drone in the original case.